If you go from that much headwind to a full legal tail, could be more than that.
To really figure how much the wind slowed you up, look at your margin vs your competitors and figure their normal performances in good conditions and the difference they had. Usually, the margin into a wind is reduced for the winner vs what would happen in good conditions because a strong wind adversely affects the fastest runners more than the slower ones because the resitance is compounded as speed increases.
Likewise, a favorable wind helps the faster runner more than the slower ones but not nearly to the same degree.