How far in advance do they award green slips? Does a commuter ever have a chance at one?
The earliest they assign GS's is the day prior. Not sure if they do it the same in every base, but in SLC the open time for the next day is typically covered by noon local time the day prior. So you may have 24-30 hours notice for a GS reporting the next day. After that they cover open time as it shows up so you can have anywhere from 24 hours to 30 minutes to a report for a GS.
Commuters do have a chance, but obviously not as likely as a local.