has anyone calculated the OT boat time?

[Beldan4]

Has anyone ever calculated the exact time on the OT boat? I play on red99 (plz mercy no trolls). The lack of porters at times makes me have to take the boat but it would be far more convenient if there was a proper exacting calculation to the time.

Best i've got is 35-37 min, but thats too big of a margin of error, it doesn't take long for the calculation to get thrown off.