Weight, mass, same diff, right?
(At least in common usage)
Good on you for committing to donate again, Ilander.
I'm not sure what the exact stats are for return donors, but I know it's more than 2. There are plenty of people who go <10 times and bring down the average, but anybody who gets over 10 is likely to get up to at least 50, given enough time. Each of the last few times I've been to the clinic I talked to at least one person who had over 100 donations. The high so far is 131.