After getting to 40k for the seal in Tempest, I basically only auto-battle for Hard 5-battle with units that have not maxed out HM yet. The AI is so dumb that even a team of fully SI'ed, arena capable 5*s can't clear that 5 battles, but normally my 2nd team will do and if not my 3rd definitely will. This is so painful to watch that most of the time I just force myself not to. lol
Anyways, with Sharena in the teams this normally results in around 350 points, which is not bad at all. It also goes by quite fast but the need to make a few extra clicks to send in a second team (and sometimes a third) is indeed pretty annoying. I think once I'm sure I have enough time to get to the next 3-orb reward tier I will stop even this and auto-battle the 3-battle normal instead.