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10-20 mins worth. Though would you really want to warm up with burpees? Sounds a bit to intense to me. Why not warm up with some jogging on the spot then do the burpees or just star jumps until your muscles are warm maybe some high knees and bum flicks. I thought burpees were about explosive power which I wouldn't be including in a warm up.
I've never bothered with warming up before a run - I just take it steady for a couple of miles. Never had an injury through it either.
As Bex says - burpees sound a bit harsh. Normally you WOULD do a warm up before those.....
Why not do a 10-20 min run outside then go inside and stretch?
Why would 5 mins of burpees be equivalent to 20 mins of slow running?