@herbie47, in Kyaw Moe's email he says 'their' boat takes 3 hours. But, I know the tides can really affect the journey time. We experienced quite a difference on our last visit to Mrauk U... 9 hours both ways (January, 2003). It was a boat we hired from the Sittwe dock with a nice French couple and supposed to only take 6 hours. The captain said it was because of a high tide. It wasn't so bad going up, since the scenery is lovely. But, going back seemed to take forever.
For anyone that wants to know:
Kyaw Moe's (Mrauk U Traveller agency) boat runs daily:
Departs Sittwe at 4 pm and costs $25.
Through Mrauk U Traveller one can coordinate flight, pick from airport and transfer to boat to avoid staying the night in Sittwe if wanted.
Departs Mrauk U at 7 am and costs $20
Mrauk U Traveller
Information about Kyaw Moe himself:
Kway Moe: Guide