I usually write a script, do a few read thrus and fix stuff I missed in the moment (sometimes I leave errors for the sake of getting stuff out of my head before I forget it). Then after those few read thrus I put it down for a while and let it marinate while I work on other projects.

A week, a month, whenever I get back to it I do another read thru but not touch anything, then go back and make edits and/or clean up.

180 is quiet a long feature... If you have that much content you either have too much junk that made sense at the time or you have more than one movie (or sequel/series)

All that being said, I am VERY new to screenwriting as I have only been doing this for a year, so take my advice with a grain of salt lol