I refer to “steps” rather than spoons. I have severe arthritis and walking exacerbates the pain, so there’s a pretty hard upper limit on how many steps I can take in a day, but there also seems to be a longer term limit that’s lower than just multiplying by the number of days. If I use up all my steps today, I can’t use as many tomorrow. If I go over my practical limit in a single day, it can take multiple days of almost zero walking to recover to my crappy baseline.