HPL started in 1920/1943 and is now heading into 1967/1990. This is as far as I know the longest running dual progressive out there and has a great group of owner.
Below are the first 7 posts from the keeper thread as posted every season giving info on keeper deadlines and draft dates way ahead of time so all are on the same page. It also gives instructions on posting in primary position to insure keepers are deleted.
We also use 1 hour time slots with 12 picks the first and second day so all have time to make deals, check keepers against availables, etc.
The first 4 rounds have times set in stone with only one pick a day so that if life distracts you and you miss a pick some guy in the next round doesn't have a chance to pick before you can catch up, insuring all get a fair chance at the best players.