Force Carbing Procedure???

So I have some people coming over tmrw for the Panther game and i want my beer ready at 4p when they get here.

I have kegged my beer at 30psi and rolled it for 1min at 15min intervals for 1 hour while its been in the fridge at 55degrees

My question is do I now purge the c02 and hit it with another 30psi or 12psi then disconnect?

Or do I reconnect the c02 and set at 30psi or 12psi and leave connected and let sit for a few hours?

Do I purge and not reconnect?

Leave as is at 30 psi over night then purge in the morning?

Thanks for any replies I searched for an answer but couldn't find what I was looking for...

I typically hit my new kegs with 25-30 psi for 48 hours, then purge and serve at 10-12 psi...

Based on your process thus far, I think I'd let it sit overnight at 25 psi...then tomorrow, purge and reset the regulator to 12 or so...

It's at 55 degrees? Then I'd keep it permanently at 20 psi for the carb level. (here's a carbonation chart: http://sdcollins.home.mindspring.com/ForceCarbonation.html)