DC 12V 0.42A 27x28x17mm Electromagnetic Lock, Unlock time?

[Rafav29]

 How long can I energize a lock like this??, I read on the internet that some, for example, must be energized for just a second, I would appreciate your answering this question.

 

Thanks.

[MrBill]

Not on topic for this forum, but the answer can only be found in the manufacturer's documentation.  Some coils might be rated for continuous duty while others may only be made for intermittent use.   Generally with door strike the models that are meant for continuous duty are quiet.  If they are noisy (buzz) they likely are not for continuous duty.