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It doesn't stipulate that because I assume they think those that take advantage of the giveaway want to use it ASAP.I have no idea what F-Secure license shelf life is but my suggestion would be to activate it in a timely fashion before they blacklist unactivated keys from that promo
I recommend as soon as possible otherwise it will be invalid. Last year I got about 100 keys for f-secure internet security for 30 days each. Most of them I shared with others users but some keys left. The left keys I couldn't activate after 2 months. So, you have time to activate within 1-2 months