Largest N such that * can win in N moves?

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j_j_j_j_j

What known position has the largest number N, such that white can always win in less then N moves?  I found one with 7 pieces and mate in 517.

atarw

no, you didn't find it. some other guy found it and you saw the position.

Scottrf

Mate in 517 with 7 pieces is a draw.

j_j_j_j_j

No, his computer found it and he saw it on his computer.  We are ignoring 50-move rule.