Hi NWDiver,
thank you!! 
We spent 7 days looking for whales from 9am to 4pm everyday and had lunch (sandwich or burger with fruits) on boat.
The Boat is quick and has enough space : 8.5-metre long, 4-metre wide, 2x 250hp 4-stroke engines.
They organized the trip very well and took us to right position/right timing to get great images under and above water. Sometimes there are lots of whales ( we swam with 9 whales in one day!!!) but sometimes there is only two or three whales to swim with.... if there is mom/calf, we can swim for a longer time.
There are two days we can not swim in as the whales are moving too fast to catch up! However, watching and shooting their social behavior above water is also excellent!!
cheers,