diff --git a/webapp/backend/pkg/database/scrutiny_repository_migrations.go b/webapp/backend/pkg/database/scrutiny_repository_migrations.go
index e1b948b..829c833 100644
--- a/webapp/backend/pkg/database/scrutiny_repository_migrations.go
+++ b/webapp/backend/pkg/database/scrutiny_repository_migrations.go
@@ -332,6 +332,12 @@ func (sr *scrutinyRepository) Migrate(ctx context.Context) error {
 						SettingDataType:       "string",
 						SettingValueString:    "smooth",
 					},
+					{
+						SettingKeyName:        "powered_on_hours_unit",
+						SettingKeyDescription: "Presentation format for device powered on time ('humanize' | 'device-hours')",
+						SettingDataType:       "string",
+						SettingValueString:    "humanize",
+					},
 
 					{
 						SettingKeyName:        "metrics.notify_level",
diff --git a/webapp/backend/pkg/models/settings.go b/webapp/backend/pkg/models/settings.go
index e564301..d40e3e9 100644
--- a/webapp/backend/pkg/models/settings.go
+++ b/webapp/backend/pkg/models/settings.go
@@ -8,13 +8,14 @@ package models
 //}
 
 type Settings struct {
-	Theme            string `json:"theme" mapstructure:"theme"`
-	Layout           string `json:"layout" mapstructure:"layout"`
-	DashboardDisplay string `json:"dashboard_display" mapstructure:"dashboard_display"`
-	DashboardSort    string `json:"dashboard_sort" mapstructure:"dashboard_sort"`
-	TemperatureUnit  string `json:"temperature_unit" mapstructure:"temperature_unit"`
-	FileSizeSIUnits  bool   `json:"file_size_si_units" mapstructure:"file_size_si_units"`
-	LineStroke       string `json:"line_stroke" mapstructure:"line_stroke"`
+	Theme              string `json:"theme" mapstructure:"theme"`
+	Layout             string `json:"layout" mapstructure:"layout"`
+	DashboardDisplay   string `json:"dashboard_display" mapstructure:"dashboard_display"`
+	DashboardSort      string `json:"dashboard_sort" mapstructure:"dashboard_sort"`
+	TemperatureUnit    string `json:"temperature_unit" mapstructure:"temperature_unit"`
+	FileSizeSIUnits    bool   `json:"file_size_si_units" mapstructure:"file_size_si_units"`
+	LineStroke         string `json:"line_stroke" mapstructure:"line_stroke"`
+	PoweredOnHoursUnit string `json:"powered_on_hours_unit" mapstructure:"powered_on_hours_unit"`
 
 	Metrics struct {
 		NotifyLevel            int  `json:"notify_level" mapstructure:"notify_level"`
diff --git a/webapp/frontend/src/app/core/config/app.config.ts b/webapp/frontend/src/app/core/config/app.config.ts
index 1b6dfe3..c5a1f6f 100644
--- a/webapp/frontend/src/app/core/config/app.config.ts
+++ b/webapp/frontend/src/app/core/config/app.config.ts
@@ -12,6 +12,8 @@ export type TemperatureUnit = 'celsius' | 'fahrenheit'
 
 export type LineStroke = 'smooth' | 'straight' | 'stepline'
 
+export type DevicePoweredOnUnit = 'humanize' | 'device_hours'
+
 
 export enum MetricsNotifyLevel {
     Warn = 1,
@@ -47,6 +49,8 @@ export interface AppConfig {
 
     file_size_si_units?: boolean;
 
+    powered_on_hours_unit?: DevicePoweredOnUnit;
+
     line_stroke?: LineStroke;
 
     // Settings from Scrutiny API
@@ -77,6 +81,7 @@ export const appConfig: AppConfig = {
 
     temperature_unit: 'celsius',
     file_size_si_units: false,
+    powered_on_hours_unit: 'humanize',
 
     line_stroke: 'smooth',
 
diff --git a/webapp/frontend/src/app/layout/common/dashboard-settings/dashboard-settings.component.html b/webapp/frontend/src/app/layout/common/dashboard-settings/dashboard-settings.component.html
index 0eb9a03..970044c 100644
--- a/webapp/frontend/src/app/layout/common/dashboard-settings/dashboard-settings.component.html
+++ b/webapp/frontend/src/app/layout/common/dashboard-settings/dashboard-settings.component.html
@@ -54,6 +54,14 @@
         </div>
 
         <div class="flex flex-col mt-5 gt-md:flex-row">
+            <mat-form-field class="flex-auto gt-xs:pr-3 gt-md:pr-3">
+                <mat-label>Powered On Format</mat-label>
+                <mat-select [(ngModel)]="poweredOnHoursUnit">
+                    <mat-option value="humanize">Humanize</mat-option>
+                    <mat-option value="device_hours">Device Hours</mat-option>
+                </mat-select>
+            </mat-form-field>
+
             <mat-form-field class="flex-auto gt-xs:pr-3 gt-md:pr-3">
                 <mat-label>Line stroke</mat-label>
                 <mat-select [(ngModel)]="lineStroke">
diff --git a/webapp/frontend/src/app/layout/common/dashboard-settings/dashboard-settings.component.ts b/webapp/frontend/src/app/layout/common/dashboard-settings/dashboard-settings.component.ts
index 94f262f..ec65157 100644
--- a/webapp/frontend/src/app/layout/common/dashboard-settings/dashboard-settings.component.ts
+++ b/webapp/frontend/src/app/layout/common/dashboard-settings/dashboard-settings.component.ts
@@ -7,7 +7,8 @@ import {
     MetricsStatusThreshold,
     TemperatureUnit,
     LineStroke,
-    Theme
+    Theme,
+    DevicePoweredOnUnit
 } from 'app/core/config/app.config';
 import {ScrutinyConfigService} from 'app/core/config/scrutiny-config.service';
 import {Subject} from 'rxjs';
@@ -24,6 +25,7 @@ export class DashboardSettingsComponent implements OnInit {
     dashboardSort: string;
     temperatureUnit: string;
     fileSizeSIUnits: boolean;
+    poweredOnHoursUnit: string;
     lineStroke: string;
     theme: string;
     statusThreshold: number;
@@ -51,6 +53,7 @@ export class DashboardSettingsComponent implements OnInit {
                 this.dashboardSort = config.dashboard_sort;
                 this.temperatureUnit = config.temperature_unit;
                 this.fileSizeSIUnits = config.file_size_si_units;
+                this.poweredOnHoursUnit = config.powered_on_hours_unit;
                 this.lineStroke = config.line_stroke;
                 this.theme = config.theme;
 
@@ -68,6 +71,7 @@ export class DashboardSettingsComponent implements OnInit {
             dashboard_sort: this.dashboardSort as DashboardSort,
             temperature_unit: this.temperatureUnit as TemperatureUnit,
             file_size_si_units: this.fileSizeSIUnits,
+            powered_on_hours_unit: this.poweredOnHoursUnit as DevicePoweredOnUnit,
             line_stroke: this.lineStroke as LineStroke,
             theme: this.theme as Theme,
             metrics: {