What I don't think is possible is to donate 100.000 miles! There is a limit and it is 50.000 :P
I already donated (not that many though). My first and third cousin are nurses ("unfortunately" only one of them works in one of the hospitals on the list, no idea why the hospital of the other one isn't on it).
By the way 14M probably won't be enough (Aegean will make that 42M and I would guess the number of staff in 17 hospitals would be a number much higher than 2100). The good thing is that so far over 121M have been accumulated, most hospitals already have enough miles for over 500 tickets, so that should be covering it more or less.
I only hope that, if by the looks of the total amount will be huge, Aegean will indeed give all the miles to the staff or return the miles proportionally to the donors if they decide to only give 20k to each of the staff members or even better just donate to more (all) hospitals...