$WebAppPoolUserName = "domainuser"
$WebAppPoolPassword = "password"

$WebAppPoolNames = @("Test","Test2")

ForEach ($WebAppPoolName in $WebAppPoolNames ) {
    $WebAppPool = New-WebAppPool -Name $WebAppPoolName
    $WebAppPool.processModel.identityType = "SpecificUser"
    $WebAppPool.processModel.username = $WebAppPoolUserName
    $WebAppPool.processModel.password = $WebAppPoolPassword
    $WebAppPool.managedPipelineMode = "Classic"
    $WebAppPool.managedRuntimeVersion = "v4.0"
    $WebAppPool | set-item
}

Set-ItemProperty 'IIS:AppPoolsDemoPool' -Name recycling.periodicRestart.requests -Value 100000

add-webconfiguration  system.applicationHost/applicationPools/applicationPoolDefaults/recycling/periodicRestart/schedule -value (New-TimeSpan -h 1 -m 30)

%appcmd% set apppool "BusinessUserApps" /+recycling.periodicRestart.schedule.[value='01:00:00']

$WebAppPool.recycling.periodicRestart.schedule = (New-TimeSpan -h 1 -m 30)

clear-ItemProperty IIS:AppPoolsMyPoolName -Name Recycling.periodicRestart.schedule #clear values
set-ItemProperty IIS:AppPoolsMyAppPoolName -Name Recycling.periodicRestart.schedule -Value @{value="00:00:00"} #to set it to midnight

$webapppool.recycling.periodicrestart.schedule -Value "01:30:00"