Mine remembers for a long time.
When he was little I gave him a toilet roll to play with. He scrabbled under him enthusiastically, but looked shocked, when he saw the mound behind him, & had much difficulty in biting across the paper, eventually finding the perforations by accident. Next day he scrabbled less & when he bit across the paper, it still took him a while to find the perforations. Day 3 he found the perforations immediately, & there was no more fun in that game.
18 months later I wondered if he could still remember what to do with a toilet roll. He scrabbled found the perforations 1st. time, & looked at me as if to say "do you think I'm daft or something?".
He also dreams, but I've only seen him have rapid eye movement sleep associated with dreaming in humans once. Most of the time whiskers are active, he makes soft grunts, & an occasional paw movement, but there's no REM & his ears are so alert that he wakes immediately to the faintest rustle of my clothing just by moving my hand. I'm daft enough to wonder what rabbits dream about. The only clue was that once he woke up & rushed to his toy rabbit for a hump.:roll:
Because I occasionally dream in music I've often wondered whether rabbits dream in other senses rather than vision. No idea!!