How long does it take to run a motocross bike in? (Honda CR125)?

I am buying a Honda CR125 and it had an engine rebuild and still needs to be run in, How long does it take to run a motocross bike in? and would it be alright just leaving it to tick over and revving it a bit now and then for a few days (obviously not leaving it on for a few days but doing it for 30 mins or so each day)
 
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