I would say 20-30 minutes would be all you need. I would stay away from squeezing the bag afterwards though. Just my opinion though. and try to steep more towards 150 than 170. you'll extract less tanins from the husks.
"Yes, I am a pirate two hundred years too late. The cannons don't thunder there's nothin' to plunder,
I'm an [under] forty victim of fate, Arriving too late, arriving too late."