I mean how much latency is even acceptable? If Django is able to deliver a result in 200ms can I even accept it being delivered with a latency of 280, 400, 700m

I mean how much latency is even acceptable? If Django is able to deliver a result in 200ms can I even accept it being delivered with a latency of 280, 400, 700ms? The long tail of these graphs seems almost useless to me for real live scaling, as the latencies involved would simply force you to scale out more (if possible).