Just wondering if there is a direct bus service between the two?

I'm guessing it is a 3 to 4 hour trip? Any idea on cost?

Thanks in advance.

I did that trip a dozen years ago in the ordinary orange bus. Sat at the back where there was room for my legs, and chatted with the bus conductor and all the locals. Had some difficulty, I remember, in not eating their food which they kindly offered me; I didn't think I could take it! The whole thing was enormous fun, cost next to nothing, and beat the boring VIP buses hollow!

Not for everyone, but it's a lovely trip down the river.