Originally Posted by
RTW1
This leaves little doubt:
Globalist Quick-Qualify for Current Explorists: Upon registration, World of Hyatt members with Explorist status will have the opportunity to earn Globalist status through February 2019 by completing at least twenty (20) Tier-Qualifying Nights at any participating Hyatt hotel or resort worldwide within 90 days of registration.
With no status you can only apply for an Explorer trial (and my assumption is thoese two cannot be combined, but knowing Hyatt I' probably wrong).
Did you read the T&Cs posted just above this ? It's 20 nights in 90 days to G*, regardless of the status (or lack thereof) at the start of the 90 days.