the longest charge should only be an hour the 1/36 it's only 20-25 min. and yeah mine get warm just keep an eye on them.... and my kids have been pretty rough with them I beleive they were trying to have a demo derby the other night I started to hear the crashes up stairs from the basement.I heard one impact that made me go down stairs and check on things and the 1/24 sct can take a pretty good beating, and as far as I see parts are pretty affordable.. and the 1/36 micro-t I got it has been jumped kicked, and slammed into things I think that highroller should hold up....... just try to make a makeshift track with some sides to get him to learn how to steer,, it works my kids are getting alot better with giving them obsticles to drive around...