Typically the lines will be 18/12 or 9/6, with some minor variation. If you get last 18, then first 18 you can be out 36 days. It has happened.

4 day holdout is there, but there are restrictions as to when and how often it can be implemented.

No TDY's in place now, but that has happened. A lot of guys were pretty mad about how it went down. I was not involved, so maybe someone who was can give the details.