I enjoy looking at other folks' bonsai trees but I just don't have the patience for them. I keep telling myself that when my kids are grown up and I'm less busy I'll explore the world of well tended plants more. Yours look great! I like the first one best.
time.....they dont require that much. Each tree, a little here and there. Big push to re-pot in the spring...thats the hardest part. Then I just cruise through them in the eve as I am winding down. Few snips here, few there. I have close to 50 in pots...few others in the ground. I think you need a few or you will get bored fast
then there is the winter, move them around a few times. I try not to leave them out if it goes less then 28. That part can be a drag. I leave them in a "cold"room, for most of the winter.
One of my buds has a couple of really cool hackberrries which were collected from a cow pasture....cows ate the new growth all the time. Trunks were 4" in dia and only two feet tall....very cool starter method