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For a Wiki entry it's quite informative on tanker types & capabilities. If you scroll down to the tactics and capabilities portion there is this....
Some firefighting aircraft can refill their tanks in mid-flight, by flying down to skim the surface of large bodies of water. One example is the Bombardier CL-415. This is particularly useful in rural areas where flying back to an airbase for refills may take too much time. In 2002 an Ontario CL-415 crew was able to refill 100 times within a 4-hour mission, delivering an astounding 162,000 US gallons (613,240 l) or 1,350,000 pounds (612 t) of water on a fire near Dryden Ontario.[citation needed] { June 1, 2002 Dryden fire # 10 Tanker #271 civil ident C-GOGE }
I flew this type for 12 seasons. I can tell you this is unusual but is common enough around the world. This represent the maximum performance under ideal circumstances with an adjacent water source. This works out to a drop every 2 minutes. Ferry time to and from the fire was 20 min each way a total of 200 minutes were spent in fire mode.