Using an 8 and 10 week strain as examples.
10 week strain in 40 weeks = 4 harvests
8 week strain in 40 weeks = 5 harvests.
Doubt the GPW difference makes up for a full extra harvest.
LOL. I am aware that you get more harvests per length of time with faster strains. That's the actual reason you tend to get more per area with a longer flowering plant.