Is a 20 mile bike ride long?

run to live:)

New member
I run a lot im a 15 year old girl. and today was supposed to be a rest day with no running,our first one in a few months.but i dont like just sitting inside escpecially when its nice outside.So i went for a bike ride the first one i only went 4 miles then i went for another one a few hrs later for 16 miles. and then i realized that prob. wasn't the smartest thing to do on a rest day so im hoping 20 miles isnt a lot...is it?oh and my avg speed was 9mph.
 
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