2 minutes is the worst delay. With 10 minutes, I can and do context switch to something else and use the time productively. With 2 min, I wait and get frustrated and bored.
Context switching makes you less productive compared to if you could completely finish one task before moving to the other though. in the limit an LLM that responds instantly is still better.
Indirectly, it sounds like you're aware about the inference speed? Imagine if it took 2 minutes instead of 10 minutes, that's what the parent means.