spectrum:All things considered more is always better but for the the divers that adapt easily it's enough to give you your "learners permit" so to speak. For the diver that needs a little more time and practice to get comfortable the all important question is ,"what is the option if I don't get it down in the alloted time?"
Pete
That is probably a great question to ask which ever dive center you choose. Go for the 2 weekends and ask what happens if you need more time.