I bid 8 days of reserve just for the fact that I'll get 30/168 somewhere in there. They can give it to you on a layover, but that's never happened to me. I've always been lucky to have it scheduled in base which allowed me to commute home and sit about 2 full days there. Also, be sure to put in a slip pref to be used only if needed to fly or shortcall for a late start rotation or short call, if you have any left. It doesn't always work, but it will sometimes save you from a 5 am uncommuteable short call if you have any left. If you're not a commuter, it shouldn't be an issue for you.