when riding alone maybe once an hour? Depending how I feel that day I guess, sometimes not at all.
BUT my 8 year old riding with me, we stop when he wants a break. I want him to enjoy it and not feel pushed to do X amount of mikes or anything so its more about spending time together than how far we got. Our max is probably about 12 miles together, he is pretty much done after that. Some days he is done after 4 just how he is feeling too.