I signed up for a 1/2 marathon for Sat Dec 14th which I am really excited to do (it's my first trail--but pretty flat race) and a lot of my friends are doing a different HM the next day (Sunday). I've done the Sunday race before and it's a lot of fun (think Santa costumes) with cute medals and they're running a $10 discount today for Small Business Saturday.
Should I sign up for the Sunday race as well, I wouldn't worry about my time and would just go out and see what I can do. If it makes a difference I am just coming off a full marathon in which I was running 6x week (think Sat runs of 13+ and then Sunday runs of 6-10 miles). TYIA!