Over night? Lol...you foam guys crack me up. Glad its working for you though. I'm not that patient.
I've used several brands of foam and MANY regular liquid solvents over the years and have had more patience than time (in years past it was work, now, @ 82 YO hard to say how much time I DO have.

). I'm liking Tactical Advantage (it is a liquid, not foam) best at the moment.
Anyway, you can soak multiple rifles simultaneously overnight, or for that matter for several hours during the day without any expenditure of time or effort and any solvent (liquid or foam) will get more copper or carbon out the longer they are allowed to soak.....assuming they are safe to leave in bore for extended time periods. (ie. solvents such as Sweet's will damage barrel if left too long).
I've got 30 + uppers hanging on racks right now though so if you'd like to drop buy and help me touch them up I'd appreciate it.
Glad the TA is workin' for ya, Greg. You know, if you line up all those uppers, you could "assembly line" 'em and about the time you applied TA to the last one, enough time would have elapsed to start dry patching the first.
Regards,
hm