I believe TFA's first few cuts were around 4 hours and that was the Version they screened to terminally ill people. Whedon said one of his AoU cuts was around 3 and a half hours... It happens all the time.
There's allegedly a 6 hour early Phantom Menace cut too
Most tent pole films that are over like 140 minutes usually have initial cuts are in the 3 and a half hour plus range but they're also usually in conditions that they'd NEVER screen to the public
They shoot a LOT of stuff for these types of films and basically recraft the films in the editing room so don't worry, it's normal