You can use the 'Compare Time' function, and add it as an extra condition for the 'Every X Seconds' Event.
This way, you have saved some time and an extra event line.
Here's a screenshot of what I did in my practice project. What it does is that it does 'Something' every 30 seconds after at least 90 seconds has passed in-game. You'll just have to change the values, and it should work as you intended.