This arrangement runs on consent and pauseability: they agree to receive, either of you can stop or change course at any moment, and 'not tonight' or 'not this way' are complete answers.
No guarantees in any direction — not longer duration, not their orgasm, not a calmer head. And for some people it changes little: if visual or fantasy-driven arousal runs hot for you, keeping your clothes on may not slow much. The interval can still work as attention structure, or it may not — you learn which by trying and reviewing.
One honest caution: with high anxiety or a trauma history, 'focus on them harder' can curdle into one more thing to monitor. If focusing starts to feel like effort or performance, drop back to something concrete — breath, touch, a pause. Discomfort is a stop signal, not a hurdle.
If finishing quickly keeps being a real problem — most encounters, real distress — this structure isn't treatment. See the first article below, and consider talking to a clinician; effective options exist.