Time periods relating to Chinese holidays (暑假, 寒假 etc.) From my understanding most Chinese workers only have one major holiday around the time of Spring Festival.

So are holidays 暑假, 寒假 only for students? Roughly speaking how long are they and when do they occur? Do they correspond with another holiday?

Is there another type of 假 that is used to describe the holiday period around Spring Festival?
假 means 假期 vacation, it also have 病假 sick days, and 请假 request a vacation/day off. 
寒假 暑假 is mainly for students and teachers.

For 暑假 it usually starts at late June, and ends at 1st Sep, it's about 2-3 months. For 寒假, it depends on the day of chinese new year, usually it starts 1 or 2 weeks before that, and last for 1 and a half months.