The tour was almos 4 hours, which looks like very long, but I think everybody can do it. The pace is quite slow but you need some skills to ride a bicycle. The trail sometimes is very narrow.
The tour stops at several temples, churches,markets, sightseeing spots and you get even a little snack of some typical Thai dishes. You also cross the Chao Phraya river twice in a ferry.
Although there is some historical content I personally would have liked to have a little bit more, get some more information about the city, the country and its story.
However I enjoyed it very much an would recommend it to everybody. You will have some great 4 hours.