How can I make a loop with random delay?

[CGxxx225 (Utterly Useless000)]

I need to spawn enemy actors in an infinite loop with a random delay each time when spawning.
I currently use 2 set timer by event on eachother to achieve it. It seems working.
But I wonder whether or not this is a proper way to do it. I am a beginner. Thanks in advance for any input.

[Everynone]

One timer might be enough:

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No timer could also work:

[CGxxx225 (Utterly Useless000)]

Thanks a lot!
Your solution is much better than my sets.