Ack! The course was changed. The bike leg is now 66 km, not 73 km.
Let's see, that's 41.01 miles, which should take under 2:25 at 17.0 mph.
Which gives me 15 extra minutes! Yay, I should definitely be able to finish under 5 hours!!
OK, let's make it 4:45. Which isn't nearly as tidy a number.