AEU was 4 weeks, BA was 5ish weeks.
MYT was 4.5 weeks, I did 320/321/330.
As you flyers know, the location diagrams are a bugger to learn by heart!
TOM I know sounds short, but as you say it is relative to the a/c.
But then saying that AEU at the time only had 73's, and that was 4 weeks, so I don't know!