PowerShell Constant Attention

# Time for loop to run
param($minutes = 920)

# Loop
$myshell = New-Object -com "Wscript.Shell"

for ($i = 0; $i -lt $minutes; $i++) {
    $myshell.sendkeys("{SCROLLLOCK}")
    Get-Date -Format "dddd MM/dd/yyyy HH:mm K" | Write-Host
    Start-Sleep -Milliseconds 100
    $myshell.sendkeys("{SCROLLLOCK}")
    Echo $i
    Start-Sleep -Seconds 60
}