How long for solving this study of Reuben Fine 1941?

[Tantale]

8/p6p/2k3p1/4Pp2/2K2P1P/6P1/8/8 w - - 0 1
White to move and win.

First move of white?

Solution here:
http://www.jmrw.com/Chess/Kloch/base.htm

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