I use 5 different banks (multiple branches of each) for pick up banks, and I have one Credit Union I use as a dump. on Saturday (my day off) I start at 8am, and go to upwards of 20 banks doing pick ups. I do stop around noon, search some of the rolls and do a dump.
I made a conscious decision to go big with this, and I get about $4000 (mixed coin) on Saturdays.
This route I have created consistently produces between $1.50 and $2.50 of silver a week.
I worked for almost a year to get this working, developing friendships with tellers, and now they normally have rolls ready for me when I get there, and they are all CWR. I even had one box of Quarters from one bank (teller told me an older couple brought it in) produce 100 silver quarters.
I said all of that to re-iterate what the people above said, in this game its all about volume & repetition.
Good Luck