Trump Campaign Adviser Steps Down While Disputing Claims Of Russia Ties
Yep. The first FISA application noted in the HPSCI was filed October 21, 2016, nearly a month after Carter Page left the Trump campaign. Then three renewals, so a total of four 90-day periods, or close to 90 days each is a reasonable assumption.
I'd really like to see the FISA application. It is supposed to contain a detail description of what info is being sought, as well as "minimization" or which names/contacts will be dropped or redacted.