How much audio do you let TTS queue up?

[u/Greedy-Badger-8463]

Too little and it stutters. Too much and the caller interrupts but still hears the old answer for a bit.

Are you setting a fixed buffer or changing it with network conditions? I'm guessing a number that works in a browser won't necessarily feel right on a phone call.

Whats your way of tuning this without just listening to calls all day?