Yikes getting homework in high school over break is pretty rugged. Usually I didn't have much in those periods if I remember correctly. In college though it's pretty much a given if you're on a semester schedule, and in grad school (at least for me) that's when the MOST work gets assigned. If you intend to go to college, which it sounds like you do, it is good practice as much as it may suck.
I had an early break (a couple weeks ago) and I had to write a 17-20 page paper, and put together a power point and a 15 minute presentation about the paper, all due in my first class after break. I was thankful that I had all the downtime afforded by the break to get it all together.
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I know I made them a promise but those are just words, and words can get weird.
I think they made themselves perfectly clear.