The burning time of dried kelp blocks is 4001 ticks.
Steps to reproduce
Place 64 dried kelp blocks into the furnace.
Put a hopper on top of the furnace and place a chest on the hopper.
Fill the chest with a large quantity of combustible items.
Position another hopper below the furnace to collect the output.
Use the '/tick sprint' command to accelerate the game.
Wait for some time.
Open the furnace and observe that the time for the fuel to run out and the time for the items to finish burning are not synchronized.
Since my English is not good, I used chatgpt to translate into English, and used Google to translate back to the original text to try to make sure it was as close to what I wanted to express.
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Another way to reproduce(real quick):
/tick freeze
Put 64 logs and 1 dried kelp block into the furnace.
/tick step 4001
/tick rate 500 (too large might cause crash)
After 4001 ticks, tick will be freezed again, and you can right click the furnace to see that it is still working.
One note: checking the code, dried kelp blocks are not the only items which have an uneven, or unusual smelting time. Take for instance carpets, which have a fuel time of 67 seconds
addFuel(map, ItemTags.WOOL_CARPETS, 67);
Can confirm in 1.20.3-pre2.