I thought that someone on this forum would come up with statistics on this subject. Apparently they don't exist or they are very obscure.

In the absence of data, let's go to anecdotes. I have participated in something over 400 SAR events, and let us just say that the time to rescue from first notification (not sure that the involvement of a PLB is particularly relevant) is highly variable. It ranges from less than five minutes to several years, or at least several days if you are only counting living rescues, not body recoveries.

If you go into the woods, you must be prepared to take good care of yourself. You cannot blindly trust the ability and availability of others, no matter how good their reputation might be. Many circumstances can delay rescue operations, the most common of which is probably inclement weather.