I do think it is possible. As Mellanhavande said I've only had dreams that lasted like 2 days and they were non-lucid, but I'm pretty sure it would be possible to trick the brain the same way substances like DMT do. I've experienced a million of lives while doing DMT, also created the opposite effect making me believe only 5 minutes had passed when actually were like 6 hours.

Either way, wasn't there an user here who spent a lifetime dreaming and then woke up traumatized?