As one would say in the computer field, this is the default.
As we have just mentioned, we may find ourselves in situations where we have a little less time. There could also be other situations. For example, when the Prime Minister appears, I would be very uncomfortable limiting his time to 10 minutes if he wishes to take more.
How are we going to handle this between us? We should discuss it now to avoid a deadlock in case the situation requires a change in this basic rule.