Critique a Boundary You've Set for Yourself

You have decided on a line and you are fairly sure it is reasonable, but you have also been fairly sure before. This gives it a direct read: is it specific enough that both of you would know if it's crossed, is it something you can actually enforce, and is it really a boundary or a demand dressed up as one.

Critique this boundary I've set for myself: [describe the boundary, who it's with, and why you set it]. Tell me honestly whether it's actually enforceable given the relationship and circumstances, whether it's specific enough that both of you would know if it's been crossed, and whether it's a boundary or actually an ultimatum in disguise. One paragraph, direct, no hedging.