M66 disable time-function Help

Greetings 

I need M66 to wait for signal without time limit.

I can use M66 P0 L4 Q5, but after 5 seconds G-code continue. Some times need to wait long time so i need if it is posible simple sollution to wait and only continue after input signal go High.

I read a lot of post but did not find some simple sollution. Thank you in advanced

Thank you for your answer

I find a way that is working for me with enable motion.feed-inhibit , this signal gives me option to wait no mater of time,

Thank you