Wildcard:Huge is an understatement... BTW how many days are we looking at here? Im thinking it wiil have to be in steps as much as I hate that.
I usually answer this one with "as long as it takes"...I know people don't like that answer It all depends on you, me, our schedules, the weather, my boat's PMS schedule, my compressor's PMS schedule, world helium market fluctuations, my wife's and 2 daughter PMS schedule, and more importantly your comfort and skill level.
If it takes 4 weekends it takes 4 weekends, if it takes 2 years it takes 2 years...but either way I will feel confident in your abilities to not kill yourself and I will be able to sleep at night.
And one of my favorite responses to some of my student's after dives is "Baby steps..."