No, that has more to do with the extent to which an intervenor is supported financially.
How long a process takes is always based on an independent decision of the panel hearing the case. Three members designated by the board will decide how much public concern there is, what part of this is in fact technical as opposed to other things, and what can be addressed under the board's jurisdiction. For people's questions, the board has never had a time limit, as long as questions are not repetitive and are relevant.