The credit will be taken off your folio as a lump sum discount. You do not need to use them up every single day. Only catch is that they're usually only applicable to incidentals. They cannot be applied to the room rate. Being that you're at the WA Orlando, racking up a bill should not be a problem.

You'll like the WA Orlando. They are generous with the upgrades. Also, if you have a car you can self-park at the Hilton Bonnet Creek parking garage and hoof it over via the skyway. Saves a little versus doing valet.