Tips from making “enemies to lovers” trope believable?

(Tips for* not from)

Need some advice for writing an enemies to lovers trope that feels authentic, mainly with pacing.

Does it always have to go from enemies to acquaintances to friends to lovers, and does it matter how much time it takes to develop this? I see some writers going entire books before they reach “lovers” status. Is it unrealistic to do it all in one book?

If one character initially dislikes the other because they are constantly coming onto them, would that still be considered enemies to lovers or is that more unrequited love?o

What makes it exciting to read? And speaking from a fantasy romance perspective, if too much time passes before anything significant happens to further the attraction, do you find yourself losing interest?

TIA!