Powershell script export users have unlimited membership

Question

Hello,

Is it possible to create powershell script of exporting users that have unlimited membership excluding groups like Domain users etc?

Right now I am using this script for temporary group assignment but since I started using this just recently I need export rest of users that have assigned groups for unlimited time

$variable = New-TimeSpan -Days 455

$users = "username" #More than 1 user "xxx","yyy"

$groups = "group_name"

Add-ADGroupMember -Identity $groups -Members $users -MemberTimeToLive $variable

Thanks in advance

Daniel