How do you say this in English (US)? Do you understand what I am saying? If no, please tell me. The bell rings when the number of the computer’s cumulative operating hours reach the each equipment’s maintenance timing.

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Thank you @bbardeo very much for your clear and precise rephrasing.
I think that is perfect, and I love to use that.....
However, to my sadness, I have to stick to the first sentence, the use of the words such as cumulative operating hours, I mean, to compare it with the each equipment's maintenance timing... sigh...I am now translating a machine's user's manual, and they are kind of keywords I can not miss... Give me additional advice...

Thank you very much @bbardeo for your kindness and patience. I’m sorry but there is one more key word. That is “ the each equipment’s maintenance timing .“ That goes like this:after 300 hours of use of the computer(cumulative operational times), you must have replaced the filter three times and the sheet one time (“the maintenance timing”) assuming that you have to replace the fan filter every 100 hours, and the screen film every 300 hours (that’s just an example: I don’t think they must be replaced that frequently.).
And I have to compare the cumulative operational times with the maintenance (replacement) timing. Please replace the word, maintenance timing, if there is anything better. Thank you again.

I am sorry for this late reply. I was too preoccupied with my daughters badminton competition which was held today. She won three games in a row.
Thank you again, @bbardeo for your help. That is beautiful and I am going to use it with some minor modification In the user’s manual. Thank you so much. Hope you have a beautiful weekend, too! :-)

Thank you very much, @bbardeo . If you ever have any questions about Japanese people, language, etc. I am here for you, too.