Times sort of adjusted based on what IF site says.
8:45, arriving at 10:45, now departs at 8:30. 11:50 sailing now departs at 11:30. Arrival time stays same. Second sailings of the day are 2 hours each. Probably will take slightly longer than 2 hours. So 2 hours is now the shortest crossing.
I was on the JS back in September '16 and we cruised across in fair weather at a top speed of 33 ktns. Took a little over 2 hours.