Chastity and orgasm denial discussion

I’m pretty much a newcomer to chastity. I’ve now been locked for three days, and last night was absolutely agonizing. I tossed and turned all evening, even catching myself dry humping without realizing it. Since I’ve never worn one before and my libido is quite strong for someone 34 years old, this feels like uncharted territory. I’m still figuring out the best way to manage it. What’s a good initial duration for staying locked? I’m essentially preparing for an actual domme/sub dynamic where I’ll be caged frequently over long stretches.