4/4 means 4 beats per measure (top number) and each beat is a quarter more (bottom number). So you can have a melody that resolves in a single measure and repeats every measure. Or 2 measures. Or 4 measures. Resolution is when you come back to the root note of the key that the song is in. Waltzes are in 3/4 time. So you’ll count 3 beats per measure but it would typically take 4 measures to resolve a melody.