They will liquidate intraday, but there are lots of buffers you have to blow through before that happens with a PM account. Roughly speaking they make you hold 10% extra margin over your requirement maintenance, so if you're "maxed out" you can lose 10% of your equity and you just can't do more trading but nothing bad happens. If you lose the next 10%, you've got until near the end of the day to fix it. If you lose more than 20%, well, maybe you should be taking your risk down and they'll do it if you don't do it first.This is a PM margin account, and my broker will probably be Interactive Brokers. I can't tell from their website whether they force liquidation immediately.
They will liquidate intraday, but there are lots of buffers you have to blow through before that happens with a PM account. Roughly speaking they make you hold 10% extra margin over your requirement maintenance, so if you're "maxed out" you can lose 10% of your equity and you just can't do more trading but nothing bad happens. If you lose the next 10%, you've got until near the end of the day to fix it. If you lose more than 20%, well, maybe you should be taking your risk down and they'll do it if you don't do it first.
Yes, you only need to meet the maintenance requirement. Because they set the initial maintenance requirement to be higher than maintenance, there's already a buffer for the market move against you before there's a potential liquidation.Are you saying that they will not liquidate until you drop below the maintenance (90% of initial) PM margin requirement?

I would say also that margin is use to close even a winning position.

IB will liquidate you if you don't cover yourself quickly. We introduce to Apex Clearing. In general, we don't auto-liquidate unless you received a risk call and were non-compliant. We expect that if you were to get a margin or DT call that you will wire in money to meet the call. My email is below if you would like me to contact you to discuss our services.
Bob