Always factored from first hash. TIDES is most similar to PPLNS, but presumably over a longer overall period with 8 buckets vs 1 which makes it smoother, fairer, and more rewarding for those that stick with the pool as its luck based.

It would be great if Luke explained this in greater detail, correcting what ive simplified above. A visual explaining payout methods and where TIDES fits in would also be an ideal addendum to the site.