Lmao0415, welcome to BetterBidding!
Although the answer to your question will most likely be specific to the hotel you're staying at, some generalities can made...
For the most part, if you're staying at a mid-tier level hotel that offers free breakfast (Hampton Inn, Comfort Inn, Holiday Inn Express, etc, etc) where breakfast is self-serve in a large room, the chances of having an issue is low.
The 'risk' (for lack of a better word) increases if you're staying at a hotel that gives vouchers for breakfast, since you will likely only receive the number of vouchers for the number of registered guests. This is more typical at hotels where breakfast is table service with a waiter/waitress.
Have you already purchased a hotel? If so, let us know which one you received (name and location) and we will be able to comment further... if you haven't yet made your purchase let us know the details of the hotel you're considering, we will have a look to research it and then comment accordingly.
Please remember to return to BetterBidding and use the PRICELINE and HOTWIRE links on the board to begin your travel purchases... or thru our sister site MAPSandHOTELS.com for your regular rate purchases.
Let us know how we can be of further help.