Mine do an awful lot and want to do more but I know a lot of their friends just have one or two hobbies. I know one of DD1’s good friends has tried and dropped absolutely everything under the sun 
DD1 (14, Y9) plays flute and violin but has those lessons in school time. Then at school (a very big comp so they have a lot of activities available at lunch/form time and before/after school) she plays on the netball team (training twice a week, matches on average once a fortnight) and the girls’ football team (training once a week, matches on average once a fortnight), and is in the orchestra and flute choir. Out of school she does trampolining once a week (2 hours), swimming twice a week (4 hours total), drama once a week (2 hours), then she’s on a hockey team that train once a week for 90 minutes plus an occasional match. So she’s pretty busy...
DD2 (12, Y8) does cello and piano lessons in school and teaches herself clarinet/ukulele/guitar/bass guitar. She’s also on the school netball team (so 2 training sessions a week and about a match a fortnight) and in orchestra and senior band. She does 2 hours of trampolining out of school as well, and then is a serious dancer so does 20 hours on school weeks.
DD3 (5, Y1) does after school football, drama, Spanish, KS1 choir, and gymnastics (so something every day!) because her school also offers a lot and if she didn’t go she’d have to go to out of school club which she doesn’t really like. Each after school club is 1 hour - it just means I collect her at 4.15 instead of 3.15. She then does Rainbows (1 hour) on a Monday, gymnastics for 1 hour on a Thursday and 1.5 hours on a Saturday.
DS1 (19, now at a Conservatoire) somehow balanced a part time job, 24 hours of dance a week, and three A levels when he was in school... I still have no clue how he did it. Now he just trains (dances from about 9-5/6 each day) and work’s about 15-20 hours a week.