I find my one band fills up my available free time balanced with work, family and social time
I would love to play in two similar bands one day before I’m way too old to do it ( I’m 61 )
We rehearse once a week as a band jam, social and material try out.
I also run the band promotion and gig hunting and arranging diaries etc
Around East Anglia there are an ever declining number of venues to play at as most have gone into Solo / Duo / open mic nights to save money
The remaining good venues are heavily booked up