Total Runtimes without Credits (except for Episode 10) and Recaps:
301. "The Next Generation" --> 50 minutes
302. "Disengage" --> 45 minutes
303. "Seventeen Seconds" --> 52 minutes
304. "No Win Scenario" --> 54 minutes
305. "Imposters" --> 50 minutes
306. "The Bounty" --> 48 minutes
307. "Dominion" --> 43 minutes
308. "Surrender" --> 48 minutes
309. "Vox" --> 44 minutes
310. "The Last Generation" --> 62 minutes
Total: 496 minutes --> 8 hours, 16 minutes
The credits are three minutes long and the recaps are about a minute-and-a-half, so I took all of those out, except for one time for the credits.
8 hours and 16 minutes gives you either:
1. Three 168-minute movies (adding the credits back in)
2. Four 124-minute movies (adding the credits back in)
Given the way movies work nowadays, I'd go with the former. So we got the equivalent of a new trilogy of nearly three-hour long films. So, if you want think of PIC Season 3 as a Movie Trilogy, pretend this is what it was, and nothing even needs to be cut out.
BTW, it's also only a slightly longer runtime than if you put TWOK, TSFS, TVH, and TUC together.
Star Trek II: The Wrath of Khan --> 113 minutes
Star Trek III: The Search for Spock --> 105 minutes
Star Trek IV: The Voyage Home --> 119 minutes
Star Trek VI: The Undiscovered Country --> 110 minutes
Total: 447 minutes --> 7 hours, 27 minutes