the expression I was using was:
return GetCallingStationTime(60) > 6 && AccessReject();
After looking over the AmigoPod Deployment Guide 3.7 I think this might be better:
return GetCallingStationTime((GetAttr('Calling-Station-Id')), 600) > 6 && AccessReject();
Unfortunately I have a limited time each day to really test this out, hence the 6 seconds in 600 seconds