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I'm using Arduino UNO to control an imatic relay board with 16 relays model srd-05vdc-sl-c. I use all the relays to control some linear actuators and everything is working fine.

My only question is: are the coils used for these relays for continuous use? I mean, can I continue to give power to some coils for more than 30 minutes? Or will they be destroyed? Should I write a specific Arduino routine to power off all the coils when not used, or can I leave them powered for 30 or more minutes?

I checked the relays and they do not overheat.

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You can leave them energized for more than 30 minutes. My 16 year old car with 250,000 km still has the original fuel pump relay. I can't imagine how many hours of continuous use it received over this period of time. The relay in my car is not the same make / model as the relays you are using, so you should check with the manufacture to see if there is a "service lifetime" specification.

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