Hedging Translation Risk with Futures

I’m confused about the use of futures to hedge translation risk when an investor wants to hedge a portfolio of assets denominated in a foreign currency.

When an investor wants to invest abroad, doesn’t he buy the foreign currency at the spot price and then hedge translation risk by taking a short futures position in the foreign currency, thereby locking in the exchange rate of the principal at the time of exit?

Therefore wouldn’t the investor’s currency return be -[(F0 - S0)/S0]? Schweser says (FT - F0)/S0.

How is the futures price of the foreign currency at the time of liquidation relevant? Thanks

Okay I think I understand. Because the holding period is unknown, the investor would have to reverse at the end of the holding period at the FT. So currency return = (FT-F0)/S0. Correct?