How far am I biking?????

I bike on a trainer... in my house because in arizona right now it is just to hot to bike outside without passing out. So i bike for 20 minutes really hard... like im dripping with sweat. how far am i biking? like how many miles? i was watching the tour de france while i was biking on my trainer and it made me feel like i was biking with them :-)
 
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