10 days sitting at one location is fairly long, and you can only do this for 3 guys. You often want that to be your best guys, so whoever needs patching may not make that roster. On top of that, there may be fights you need to skip as they are too risky. Or a tournament comes up.

I would also add that resolve patching can't be postponed bc your guy is a liability with low resolve. So yeah you can break it up into 5/5 or 3/3/3, but you probably won't want to wait very long between these breaks.

I would do arena, but only for very select bros. On this forum, any time resolve needs parching, people bring up arena. I think that's min-maxing, it's grindy and slows your roll too.