Trigger worked after a certain time

[granva]

Hi all, how do I make the trigger work after a certain time, i.e. (if the backup channel is down for less than an hour, do not trigger. if the main channel is down for less than half an hour, do not trigger) now the expression is (last(/Template RouterOS routers/isp.stats,#1)="r-down")

[granva]

For example, like this:

Code:
count(/Template RouterOS routers/isp.stats,30m, "ne", "r-down")=0

The meaning of the expression: it works if no values other than "r-down" are in the last 30 minutes in the corresponding data element.
In other words: all values in the last half hour are "r-down" and no other values. (C) Kos. Thanks to Kos

[granva]

For example, like this:

Code:
count(/Template RouterOS routers/isp.stats,30m, "ne", "r-down")=0

The meaning of the expression: it works if no values other than "r-down" are in the last 30 minutes in the corresponding data element.
In other words: all values in the last half hour are "r-down" and no other values. (C) Kos. Thanks to Kos