This PowerShell script allows you to show timed notification on your Win10 system. It can be useful to show reminders

show-notification-win10.ps1

function Show-Notification {
    [cmdletbinding()]
    Param (
        [string]
        $ToastTitle,
        [string]
        [parameter(ValueFromPipeline)]
        $ToastText
    )

    [Windows.UI.Notifications.ToastNotificationManager, Windows.UI.Notifications, ContentType = WindowsRuntime] > $null
    $Template = [Windows.UI.Notifications.ToastNotificationManager]::GetTemplateContent([Windows.UI.Notifications.ToastTemplateType]::ToastText02)

    $RawXml = [xml] $Template.GetXml()
    ($RawXml.toast.visual.binding.text|where {$_.id -eq "1"}).AppendChild($RawXml.CreateTextNode($ToastTitle)) > $null
    ($RawXml.toast.visual.binding.text|where {$_.id -eq "2"}).AppendChild($RawXml.CreateTextNode($ToastText)) > $null

    $SerializedXml = New-Object Windows.Data.Xml.Dom.XmlDocument
    $SerializedXml.LoadXml($RawXml.OuterXml)

    $Toast = [Windows.UI.Notifications.ToastNotification]::new($SerializedXml)
    $Toast.Tag = "PowerShell"
    $Toast.Group = "PowerShell"
    $Toast.ExpirationTime = [DateTimeOffset]::Now.AddMinutes(1)

    $Notifier = [Windows.UI.Notifications.ToastNotificationManager]::CreateToastNotifier("PowerShell")
    $Notifier.Show($Toast);
}



$timer = new-timespan -Hours 6
$clock = [diagnostics.stopwatch]::StartNew()
while ($clock.elapsed -lt $timer){
Show-Notification  -ToastTitle "My title" -ToastText "A message that will be displayed" 
start-sleep -seconds 300
}
write-host "Timer end"