Mate in 300

According to my chess engine, this position is mate in 300:

Of course, you would run into the draw by 50 move rule first.

It's white's move

Mate in 300 is impossible here, because of the 50 move rule.

On the 50th move, a pawn needs to promote or else it's a draw.

On the 100th move, queens need to get exchanged or else it's a draw,

On the 150th move, checkmate needs to be delivered or else it's a draw,

Yes, its very strange. After me leaving the computer on for 20 minutes, it has finally decided its mate in 15. I have no idea why it couldn't find that in the first 2 minutes, or the first 10 minutes.

Hi

50 move rule isn’t automatic, so mate in 300 is possible.

However, after 75 moves without capture or pawn movement the game is automatically drawn, without a player having to claim.