Just sharing my experience since I ran into this issue. I mailed my return in right away because I did hear about the March 17 fix and I thought mailing was my only option. I didn't make any changes from when I tried to efile, which was rejected.
Mailed on about 2/12, they received on about 3/11, and just approved yesterday without any issues. I see a scheduled deposit in my account today (3/22). Almost 6 weeks in total. I would guess this would be a typical time frame if you tried to mail.
