in Russia at school we have 4 holidays - in autumn, winter and spring (each about 2 weelks), and in summer - 3 months! At university only 2 months in summer and maybe 3 weeks in winter

Hi....Sorry, I have no spring break, I have only summer holidays and winter holidays! My summer holiday is about one month,and winter holiday is about two months! lol.

"How long is your spring break?" sounds better.