When you look at your Dashboard you'll notice there are two types of solvers: hybrid and QPU. You can use the time on your account for either. You have a single quota that applies to both types of solvers, but the solvers consume time at different rates. When you view the hybrid solvers on the Dashboard, you are shown the amount of time remaining should you choose to use it all with the hybrid solvers, and similarly for the QPU solvers.
When you run a problem on a QPU solver, the QPU access time is decremented from your account total at the QPU rate. When you submit a problem to a hybrid solver, the run time you specify is decremented from your account total at the hybrid solver rate.
More information about timing can be found below: