¿cuánto dinero tiene carlos para gastar?

How much money does Carlos have to spend

Your question translates to:

How much money does Carlos have to spend?

I'm not sure if you mean for us to translate or to answer. but i'll translate as these are questions for you to answer. 1. how long has it been since you've read a book? . 2. how long has it been since you've eaten breakfast? . 3. how long has it been since you've talked with your spanish professor?