Are we talking about a beginner learning basic muscle memory, or a more experienced player tackling more advanced aspects of music or technique?
If you are training your hands to do completely new things, like holding an instrument, then yes, daily practice is going to help you develop muscle memory. Stopping won't really cause regression, it may just slow the development a bit, but that's okay! If your body tells you to stop you need to listen to it or you can do real, long-lasting damage. There's a difference between "My fingers are sore because they haven't developed calluses yet" and "My tendons are swelling up because I keep my wrist bent for hours every day."
Having a teacher or mentor guide your practice makes a huge difference. Even after 20 years, it's hard to sit down and practice without a goal. Am I working on a concept, technique, song, transcription, etc.? If not, I'm just playing, which is fine, but not the same as focused practice with the intent to improve and develop.
Also remember that music isn't just about your hands or even the bass itself. Breaks can be good! It could be a break from the instrument, or your practice routine, or even the kind of music you listen to. When I was playing 4+ nights per week the last thing I wanted to do on my day off was plug in my bass, so I'd often listen to new music, or chart out songs by ear, to continue improving my musical skills and vocabulary without only devoting my energy into plucking the strings.