4-Way Handshake vs PMKID

[melmansuri]

The main time for computation is in the PBKDF2 (99.99999%, well not exactly but you get the point), not anything after that. Therefore anything after that PBKDF2 can be seen as almost not existent.

So if I get your point, the two attacks take the same time because both of them use PBKDF2 in the beginning and the other functions (SHA-1 and PRF512) are faster calculating the hashes. So the only time to consider is the PBKDF2 function.