OPK Question for those that were TTC

As

The cycle you conceived your twins, did you have a longer, normal, or shorter than average LH surge? I’m reading interesting info on mamas of twins and some are saying theirs was longer and some even shorter! Also, are your twins identical or no?

*i don’t follow the whole stop after your first positive (luckily, or I wouldn’t be pregnant) so I don’t need told that 800 Times lol