Detect charm will help you if the servitor isn't leaving instantly. Most cases it's gonna leave the hour it becomes unbound, some don't and detect charm helps with that. It's more of a guess when the tick is gonna come through. So I spam and I watch the hour. When I get that slight lag that comes before a tick, I enter the command. Basically spamming look on the keypad and enter as soon as I think it's gonna tick. Archons and the like there's only one chance, and it's purely a guess. Elementals you have a slightly longer chance, but it's not easy still. Back in the day you had time, but after I played a conjurer that would rebind my own, then give my next conjuration to another conjurer, the immortals changed it. So it might actually make them angry that I do it now.