How long should a campaign run?

Below about a week the campaign runs out before it can be noticed, discussed and acted on. Most of the budget ends up going to wallets that were already going to deposit, because the people who needed to hear about it first still haven't. The window has to be long enough for one full cycle of someone seeing it, checking it, and moving funds.

Past about three weeks the opposite problem appears: the daily reward pool thins out relative to the attention it costs to sustain, and the deadline stops functioning as a reason to act now. If what you actually need is TVL held for months, the better structure is a short boost to establish the position followed by retention terms on what stays — not one long campaign that spends the same budget at a lower daily rate.