Hi!
I believe the 30 minute window starts when the pL2 swap begins.
Not confirmed: I THINK it starts at Noon Thursday.
Please check Twitter and Telegram for updates.
The 30 minute grace period happens only once. It is meant to allow presale participants to stake to the various pools and farms before liquidity is added, to give us a head start on earnings.
You can still stake after the 30 minute grace period, but the APR will start dropping as more and more people stake their liquidity pairs or tokens. So max profit occurs the earlier you can stake.
Not trade advice, DYOR. Please confirm dates and times for these catalysts for yourself. I am not 100% sure on the time that the swap and grace period starts.
Thanks for reading! ~ Ryan