Episode 5 seems to want to convey that Luke was on Dagobah for a while, and mastery of the Force is a slow, incremental process requiring training, even though it’s hard to understand how Luke could have been on Dagobah for long given the overall plot logistics.
Well, if you’re willing to inject some hard sci-fi into your space fantasy, without a hyperdrive, the Falcon would’ve had to travel from Hoth to Bespin in real space at near-light velocity, which would’ve subjected the crew to relativistic time dilation. So everyone aboard the Falcon may’ve only experienced an hours’-long trip while six months elapsed for the rest of the galaxy.