Time off, does it hurt business much?

Hello Everyone! So  how has your experience been with time off? I have to go out of town from the 13th to the 22nd of August and I'm really afraid about what it might do to my business. I have been growing steadily for the last 4 months and since my recent separation and pending divorce, my income and livelihood for my family depends on it. Naturally, I still have my "day job" as a guitar teacher. I'll have that till my hands fall off, but it takes a little more than that to raise a 15 year old girl!!

So, what is the best way to go "on vacation?" Should I put everything in inventory listings with a statement within the listing that no orders will be processed till after the 25th for example? Or, is there a better way. Please feel free to visit my store and see how it's arranged at the present.
I am a new E-Bayer in terms of volume. I've sold a few things here and there for a long time but nothing major and organized until February of this year.

I'm looking for help from you successful experts that actually know what you're doing!! I would so appreciate any ideas you may have to help me out. Oh, and in case this is relevant, I usually take 5 business days to process orders. At first it was three, but the volume is overwhelming me right now with the other job, and as I said before divorce, oh yeah......and preparing to  homeschool the freshman in high school (she starts online the 22nd!!!! aaaagh!)

Thanks in advance for any help!! Have a fabulous weekend!!

Francesca