[Question] about Netwatch , how many ping does it count ?

about Netwatch , how many ping does it count before change status ?
and is it customizable ?
cause i wanna run script when down , only if it was down for 15 minutes .

http://www.mikrotik.com/testdocs/ros/2.9/tools/netwatch.php

It look like one. I guess you could just set up a huge ping timeout in netwatch, to achieve what you want.