How much work is it to mod a small community on Lemmy or Kbin?

There are a bunch of niche communities from reddit I miss. I wouldn't mind starting some of them, but I can't be spending hours a day dealing with petty bullshit and weird tech stuff.

I almost exclusively used reddit from my phone, and I expect that whether I settle on Lemmy or Kbin (I have accounts on both, trying to figure out if there is a meaningful difference), I will also be mostly mobile-based, if that is helpful.

I never modded a subreddit, so I have no basis for comparison of workload.

Some of the subreddits I miss are /r/geology, /r/geologygifs, /r/phish, /r/kgatlw, /r/boston, /r/baseball, /r/redsox, /r/mapporn, /r/manholeporn, /r/printmaking, and /r/burningman.

So if I start some communities (or magazines, I guess?) over here, how much work am I signing myself up for? Like, if I signed myself up to start 4-5 of these in the hopes that they would become functional communities, would I hate myself in a year?