The reason for a high max wait time was to ensure that reads aren't
cancelled when there is data waiting for it in Go or the OS's receive
buffer. Unfortunately, there is no way to know ahead of time how long
this should take.
This new code uses 2x the fastest successful read time as the max read
time. This allows the code to adapt to whatever host it is running on.
https://github.com/jackc/pgx/issues/1481
Jack Christensen
898891a6ee