For the entire duration of the holidays to be exact.
7 weeks, and during some time I was at school, so that's about 9 - 13 weeks it's been absent..
I'm sorry if this seems too soon to worry..

Oh well.. here's some information so I can get better answers:
I'm fourteen
Virgin
No changes in diet
No large amounts of exercise
Not much stress, I've been fairly happy and not under any pressure, seeing as there's No school
I never usually have irregular periods

Well
What should I do? Any idea what's wrong?

At 14, your body is still changing and growing. When I first started my period, it was over a year before I was able to start calculating accurately; one month it was 15 days apart, the next it was 31 days apart.

It could be a sign of something more serious, but you're still very young and not fully developed yet.