You can create a PowerShell Script named keepawake.ps1 with the following code:

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param([int]$minutes=60)  # input param, 60 minutes if no value provided

$wsh = New-Object -ComObject WScript.Shell
$cur = Get-Date # Current time
$tar = $cur.AddMinutes($minutes) # Target time

# $RNDSleep = Get-Random -Minimum 30 -Maximum 200
# $MINS = RNDSleep / 60

while ($cur -lt $tar) {
# Send Shift+F15
$wsh.SendKeys('+{F15}')
    Start-Sleep -seconds 240  # sleep for 4 minutes
    $cur = Get-Date
}

Use it with:

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powershell.exe -file keepawake.ps1 -minutes 20

Reference