Running

I reckon a 90 minute half would get you up the hill in 2:05 - 2:15

I also reckon you've got a heap of work to do to get down to 90 minutes - you'll be needing to run a sub-20 minute 5k and a 41 minute 10k to be on track.

Yep, aware that it's possibly a goal too far, but may as well try.