3 calls a day might not seem like much, but it is if you consider not all "calls" are single sortie and/or "flying day" missions and can pull more than a single airframe and crew into the fold.
Then the actual resources used on "a call" increases quickly...the last SAR I was called out on was the helo that went down last winter IVO Sudbury. That was a multi-day, multi-aircraft "call".
https://wawa-news.com/index.php/2019/03/12/search-continues-for-missing-couple-and-helicopter/
The helicopter was initially reported missing Wednesday, March 6...Joint Rescue Coordination Centre Trenton began the search with RCAF aircraft and Civil Air Search and Rescue Association (CASARA) personnel on Wednesday, March 6, and the mission was upgraded to a major SAR operation on Saturday, March 9..and ended with the discovery of their aircraft on March 11, 2019.
At its height, the search involved seven RCAF aircraft, a Canadian Coast Guard helicopter, and three Civil Air Search and Rescue Association (CASARA) aircraft. RCAF personnel and aircraft came from 424 Transport and Rescue Squadron from 8 Wing Trenton, Ontario; 435 Transport and Rescue Squadron from 17 Wing Winnipeg, Manitoba; 439 Combat Support Squadron from 3 Wing Bagotville, Quebec; 405 Long Range Patrol Squadron from 14 Wing Greenwood, Nova Scotia. RCAF aircraft included three CC-130 Hercules aircraft, three CH-146 Griffon helicopters and a CP-140 Aurora long-range patrol aircraft.
Some SAR Sqns are actually Transport and Rescue Sqns...the crews are likely not short on hours very often.
442 Transport and Rescue Squadron
The primary role of 442 Transport and Rescue Squadron is the provision of aviation resources in support of the Joint Rescue Coordination Center (JRCC) Victoria. This region consists of approximately 920,000 square kilometers of mainly mountainous terrain of Yukon and British Columbia and 560,000 square kilometers of the Pacific Ocean extending to approximately 600 nautical miles offshore, including over 27,000 kilometers of rugged British Columbia coastline.
424 Transport and Rescue Sqn
424 (Tiger) Squadron is a Transport and Rescue Squadron based at 8 Wing Trenton. To fulfil its roles, 424 Squadron operates the CH-146 Griffon helicopter and the CC-130H Hercules.
424 Squadron and 435 Transport and Rescue Squadron, operating from 17 Wing Winnipeg, Manitoba, provide primary search and rescue response for the Trenton Search and Rescue Region (SRR), the largest in Canada. The Trenton SRR extends from Quebec to the British Columbia/Alberta border, and from the Canada/United States border to the North Pole.
The Squadron crews one aircraft of each type on standby response posture in order to respond to distress cases as tasked by Joint Rescue Coordination Centre Trenton.
435 Transport and Rescue Squadron
435 Transport and Rescue (T&S) Squadron at 17 Wing Winnipeg; and 424 T&R Squadron at 8 Wing Trenton, Ontario, provide primary search and rescue response for the Trenton Search and Rescue Region, the largest in Canada, which extends from Quebec City to the British Columbia/Alberta border, and from the Canada/United States border to the North Pole.
413 Transport and Rescue Squadron
413 Transport and Rescue Squadron (TRS) conducts search and rescue and airlift throughout an 1,800,000 square mile area in eastern Canada.
As the primary air search and rescue unit on Canada's East Coast, 413 Squadron crews cover an area extending from the south of Nova Scotia , north to Iqaluit on Baffin Island as far west as Quebec City and east out to the middle of the Atlantic.