It seems the ideal Hollywood lesbian kiss lasts 25 seconds. From

A friendly kiss escalates quickly.

Talk Dirty and Kiss Me

Hold Me Thrill Me Kiss me

Glued and deep kiss

found another naked girl to kiss

My first kiss with another mom : )

Hidden camera in the hotel film our first adult kiss

a savory kiss with my bestie

Always a little nicer when the kiss happens naturally

How passionately they kiss!

had to kiss her the day we became roomies at university