It depends on speed weather etc. I'm 13 right now but when I was 8 I could do about 30 miles on my BMX at about 5-6 m.p.h. with ease. My dad and I would regularly bike ofr groceries when the Porsche was in the shop (and with the renowned Porsche reliability it nearly always was) That being said I stopped about 5 times and had a rest break at the local supermarket. Took us about 8 hours round trip (including shopping)