To: GameFly Answers Member Support
Subject: Abusive Answer Content Report
Question: How long is the Campaign in Mass Effect 3?
Answer: 40-50 hours to see it all seems pretty reasonable. It took me about 30 hours to see a decent amount of Mass Effect and about 50 hours to see almost everything in Mass Effect 2.
This site will help you if you want to know how long a game takes to finish. It lets people log their game time and averages everything out to determine how long the game takes to beat for the fastest speedruns, just the critical path, critical path plus some side content, and completionists. Right now there's only one play logged for just the critical path plus some side content, and it comes out to about 26 hours, but that person may not have done a ton of side content.
Plus, there's also multiplayer to play, which probably isn't counted in with the playtime on your save file.