As we all know, stats can be used to prove anything (or nothing) depending on the eye of the beholder.
However, as far as standby goes, most of the Armed Forces (and UKCG - and RNLI while we are about it) are on standby 24/7 for something or other, and when required respond in whatever way required.
Re SAROPS
Maybe the Chinook could take on SAR standby duties 24/7
I've done SAR in SH aircraft (and Shacks of course) and SH tasks in SAR. Like T_and_B my crew and I also got over 11 hours strapped to a Chinook West of Cork - only this was 20 years ago - when called out on standby one Sunday. Odiham also generated 2 other non standby crews and aircraft (complete with winches that had not been used before) which were airborne on task within three hours from the initial call. (Air India)