I found and I know a number of other have that Fink is very short on bike miles particularly if you don't have a history in cycling. If you have years of century rides behind you and you need to concentrate on the run or swim I'm sure it's fine
The swim sessions are ok, I found them a bit hard to complete in 1hr and I managed the swim at Challenge Henley in 1:28 (not fast but not dead slow either). Nice to have a plan when you get in the pool and helps to reduce boredom.
Good book to keep dipping into as is "Going Long".