i got a few. my biggest is about 8yrs old so its fairly big takes alot of time to build them and shape them. i put like a hour a week into all of mine mostley on the young ones molding them with wire getting the right shapes. once you get the shape it only takes like 10mins a week trimming them to look good. my big ones a Juniper and i have a elm and 2 pines, the pines are 8 mths so it still needs constant moulding and shaping the elm is a little older so its now at the pruning stage as the trunks are the right shape.
bonsais are awesome, they look sick and dont take heaps of time and are relaxing 2 work on. i do it 2 chill after work or when im bored. highly recomend bonsai to anyone.