That's nothing compared to the range of the H8K "Emily". The big Kawanishi flying boat had a range of 3000+ mi. (4,474mi at max overload weight).
When the first two prototypes undertook "Operation K", the second bombing of Pearl Harbor, they flew from Wotje in the Marshall Islands. Even though they had the range to do the mission non-stop, they refueled from subs at French Frigate Shoals because Combined Fleet did not want to chance losing the 2 very valuable prototypes.
The "Emily" was considered so important to the war effort by the IJN that they were the only aircraft expressly forbidden to undertake Kamikazi missions later in the war.
It was no dog either. When the last flyable H8K was being delivered to the USN for shipment to the US for testing, (which was also the last mission of a Japanese Imperial aircraft flown by a Japanese crew), it had to fly a zig zag pattern because the escorting USN PBY Catalina could not keep up. This aircraft was later returned to Japan and now is on display at the Japanese Maritime Museum in Tokyo.
