Hi Phil,
I wasn't too concerned about the total run time when I started learning the full pattern. Just more concerned about having the plane in a "retrieveable" position when I knew the engine was about to quit.

A stop watch can be a mans best friend when learning the pattern.
The main focus for me was to learn all of the manouvres one at a time until I could fly the whole pattern.
I put all of the stunts together in sequence with all of the level flight laps every flight right up until I learnt the clover, by which stage I could fly the pattern and the proper order of things was then second nature to me.
I just need to get good at it!
After I could complete the pattern in sequence I concentrated on the total elapsed time of the engine run.
When I am sport flying with the local blokes we try to load as much fuel on board as possible. It gives you more air time over the course of the day as lots of coffee drinking and general BS get in the road of the serious business of flying!
Cheers, Rob.