I think this is it

Restart-EndpointOnUptime.ps1

@@ -1,11 +1,21 @@
+# Function to restart an endpoint that has not been restarted for the specified number of hours
 Function Restart-EndpointOnUptime ([int]$MaxUptimeHours) {
 
-    # Get the last boot up time as a DateTime
-    $LastBootUpTime = [Management.ManagementDateTimeConverter]::ToDateTime($(Get-WmiObject -Class Win32_OperatingSystem -ErrorAction Stop | Select-Object -ExpandProperty LastBootUpTime))
+    # Exit if the specified number of hours is not greater than 0
+    If ( !($MaxUptimeHours -gt 0) ) { Write-Output "Must specify 1 or more hours" ; Exit }
 
-    # If the number of hours the system has been up is greater than $MaxUptimeHours, restart the endpoint
-    If ($($(Get-Date) - $LastBootUpTime).TotalHours -gt $MaxUptimeHours) {
-        Write-Output "Restarting computer because it has not been restarted in the last ${MaxUptimeHours} hours."
-        #Restart-Computer -Force
+    # Get the last boot up time as a DateTime
+    $LastBootTime = [Management.ManagementDateTimeConverter]::ToDateTime($(Get-WmiObject -Class Win32_OperatingSystem -ErrorAction Stop | Select-Object -ExpandProperty LastBootUpTime))
+
+    # Get the total number of hours the endpoint has been up
+    $UptimeHours = $($(Get-Date) - $LastBootTime).TotalHours
+
+    # If $Uptime is greater than $MaxUptimeHours, restart the endpoint
+    If ( $UptimeHours -gt $MaxUptimeHours) {
+        Write-Output "This endpoint has been up for at least ${UptimeHours} hours and will be restarted now"
+        Start-Sleep -Seconds 5
+        Restart-Computer -Force
+    } Else {
+        Write-Output "This endpoint has already been restarted within the last ${MaxUptimeHours} hours"
     }
 }