When did the 90 days officially start?

The 90 days officially started when the Masternode was being tested - on October 22nd, 2021 (so they will automatically end on January 20th, 2022). However the Masternode was released to the public on November 24th. 

Out of fairness to the POP Network community, a list of Masternode operators will be gathered from January 20th until February 19th. The people in that list will be sent the other half of their rewards afterwards to compensate for the one month of rewards they lost when the Smart Contract 90 days automatically expired on January 20th.