This is something that gets discussed a lot around here, obviously. It's the core of TRP philosophy; self control. However, most of the time, this is discussed as a response to a shit test. Either that, or just using "maintain frame" as a way to respond to some outside element that requires taking action in some way. What I'd like to emphasize here is that maintaining frame is something that should be static, not dynamic. You should always be unshakable. You can't just "turn on the frame" when you're trying to pass a shit test and expect it to work.

The second point I'd like to address about frame is the reason why it's important. As stated above, the majority of the time it's discussed here is to demonstrate value to a girl when she's throwing shit test after shit test at you. Though this works, this line of thinking is coming from a place of neediness. Wanting to maintain frame for the purpose of passing a shit test is still beta(ish) thinking. It's not a means to an end. It's simply a way to live. Maintain frame to demonstrate value to yourself above all others.

Don't expect to reap instant results from maintaining frame alone. It's very likely that even though you maintained frame, passed shit tests, and did everything right, things sometimes just don't go your way. This is why we do it for ourselves and not the benefit of a girl or anyone else. So that when you experience rejection, you are comfortable enough in your own frame to not let it get to you.

tl;dr: Don't expect anything special from maintaining frame, just do it because it's the best base to build your value off of.