I don't really play a Necros (Morticians in FARA) much but let me answer your ancient question anyway.. supposing you didn't "S" stealth and go back to your settlement to sleep, you would have pressed "R" and chosen to rest until morning -- after closing the door and perhaps building a Bed for the "well-rested" buff. Other than that, one day seems to equal about 120 steps on the overland map.
Cheers. Pug out.