Currently, seigniorage mining (adding LP to receive new USD) has no time weight feature.
It is proposed to add a minimum lock time to the stake/deposit function, such that the user upon depositing must wait at least the minimum wait time to withdraw his/her LP tokens.
During this wait time, they are free to claim seigniorage USD no problem.
Initially, this value will be 24 hours but it can be reduced or increased via Seigniorage Governor Alpha on the dashboard.