@Kimberly719
It's really up to you. A lot of hosts just leave a starter pack for longer stays. I have supplies for the duration, even if they are staying for months, but then I host in my own home, so obviously we are not going to run out of toilet paper! However, that also goes for anything else I include in my amenities, such as tea, coffee, sugar, salt, pepper, oil, soap, shampoo, conditioner and body wash.
I find that, apart from toilet paper and dish soap, most long term guests don't actually use that much of the other stuff and usually will buy their own. In fact, they often leave these things behind so I have to buy even less of them.
The most important thing, as @Ted307 mentioned, is to make it clear on your listing if you are only supplying a starter pack and they need to buy their own supplies after that. It's all about setting expectations. Under promise and overdeliver... Never the other way around.