Two hours of playtime and an hour of confinement would be the short description.
The longer description is that you simply surrender yourself to your Mistress for three hours, and I will decide how that time together will be spent. While keeping your limits in mind, of course.
Will I start with a strict examination of your body, and will I like what I see? In that case it might be possible that I'll keep on playing with you, for then the moment has come to actually use your body for my purposes.
Or perhaps you will not pass my inspection, and you'll be locked up first, as punishment. Possibly to give you a second chance later, or maybe I will test you in other ways during your confinement.
Confinement can also be a moment of calm, for when I have let you experience both heaven and hell, you will need a moment to catch your breath. Locked up snug and secure, losing all sense of time and listening to nothing but your own breath and heartbeat.
Until you can suddenly hear the clicking of my heels... what will I do next?