Nginx access_log default flush time

Question

How frequently nginx flushes its buffer to access_log by default ?

In manual there is not info, just setup syntax:

access_log path [format [buffer=size [flush=time]] [if=condition]];

Answer 1

Nginx doesn't flush unless you specify the flush option (even if you have specified the buffer option).

Here's an example of how to buffer packets of 8k to the log every five minutes:

access_log  /var/log/nginx/access.log  main buffer=8k flush=5m;