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The SF limits are said to reset every 24 hours - how do I know when exactly? Is it on some constant time of day for all the orgs, or based on the org time zone?

For example - if I have crossed the callout limit, when will it be reset and I would be able to callout again?

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The e-mail limits are calculated based on Greenwich Mean Time - see "Email Limits" in http://www.salesforce.com/us/developer/docs/apexcode/Content/apex_gov_limits.htm

I think other limits are calculated on a 24-hour basis, but I'm not 100% certain. I don't believe limits are ever "reset" to 0. We've watched our API usage at my company, and we noticed them fluctuating throughout the day.

Also from the documentation above: "The maximum number of batch executions is 250,000 per 24 hours." The language used (Per 24 hours) seems to indicate an on-going basis.

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    This is what I've always been lead to believe as well. API calls for instance are "last 24 hours" for certain (if you are nearing your limits and/or have the warnings being sent to you, this relays this fact pretty clearly).
    – AMM
    Commented Dec 26, 2012 at 21:13
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I believe it is cumulative over a given 24 hour period rather than being set at specific points in time, i.e. between 00:00 and 23:59. I think it checks the preceding 24 hours to see how many callouts have been made in that time period, and if you've exceeded the limit it will raise an exception.

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  • Thanks, do you think it checks this time based on the org's timezone?
    – Dedo
    Commented Dec 27, 2012 at 6:28
  • Of course I don't know for sure (the docs are a little vague) but I think it just checks the preceding 24 hours of activity Commented Dec 27, 2012 at 9:15
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I was wondering as well and checked with the Salesforce Support team - it's a 24h sliding window.

You can take it quite literally as exactly “the last 24 hours”.

I wrote a short post about this here: https://mbwhatsnew.wordpress.com/2017/07/10/when-does-the-salesforce-api-limit-reset/

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