Project > Settings… > Katalon TestOps opens the Katalon TestOps dialog.
Do you have Enable Katalon TestOps Integration option ON?
I guess, you happened to turn the option from OFF to ON. Or you installed a new version of KS which has the option ON as default. Or you started using VisualTesting by TestOps recently.
Why not you to try disabling it.
If the TestOps integration option is ON, KS uploads the Test Suite’s results to the remote TestOps server. Your test cases seem to be large., and a test suite with large test cases emits bulky reports. Let me guess, uploading the bulky reports take 3 minutes after each Test Suite execution. You wrote that you repeat Test Suites 68 times. So, upload will possibly take over 3 hours= (3 minutes of upload * 68 times).
If you are using VisualTesting feature of TestOps, it would take even longer time to upload screenshot images from your PC to the remote TestOps server.
You are right! Uploading test suite results & images to TestOps — these tasks are done by KS behind the scene after a test suite finished and before the next test suite in a Test Suite Collection starts.
I am afraid your TestSuiteCollection is too heavy to utilise the TestOps features comfortably. You need to make your test cases flyweight.
I would suggest you to try disabling TestOps integration. Your test suite collection will run briskly as before, I think.