Can we do spaced repetition if we just study for one day? If yes, how?

Yes we can. For example, we have 3 topics to review: Topic A, B and C. We can start by studying Topic A for 1 hour. Then after a break, before moving on to Topic B, we try to recall what we learn about Topic A. We rate how difficult it was to recall Topic A. After that, once the review Topic B is done, we take a break. Before we start studying Topic C, we recall what we learn of Topic B and rate the difficulty. Finally, we review Topic C and try to recall all 3 topics at the end of the day. But it is recommend that we space it out over 1 day, 3 days, 1 week and 1 month.