ok i'll jump in here and others can too. . . but i would be keeping that pool open as long as possible with new plaster. ur PH is prob rising daily. . . hourly. you want to at least keep it open long enough to do the plaster start up. you have to pretty much. you have at least 4 weeks of brushing along with that PH rise which will be present for a while. but the longer you can keep it open the better.
did they give u the startup procedure for ur plaster. mine was quartz. it's a 28 day startup. but also went another 3 months before i closed cause of the ph rise and didn't want to run the risk of scale build up.
you really need to keep it open as long as u can. i'm in pa. as long as u are running the pump to keep that water flowing keep it open. get the plaster under control as long as possible.
jim