While summoned, Familiars will slowly deplete the Summon Gauge, which is displayed on the Overview page on the Familiar Interface and as an active buff timer on the upper right corner of the screen. Once the gauge is depleted, all summoned Familiars are automatically dismissed and cannot be re-summoned. The Summon Gauge refills automatically at midnight UTC, but can also partially be refilled with Familiar Essence. The rate at which the gauge is depleted is based on the cumulative defense value of all summoned Familiars. The higher the total defense, the slower the gauge will deplete: the gauge will normally deplete at a rate of 15 per minute. If Familiars are unsummoned before a minute is up, the depletion rate will be prorated, rounded up. Every 20 cumulative defense across all summoned Familiars will decrease the depletion rate by 1 per minute. On average with three Familiars summoned, a full gauge is roughly two hours of continuous use.