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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

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 Dec 26 '12 at 21:13

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 Dec 27 '12 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 – Phil Hawthorn Dec 27 '12 at 9:15

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:

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While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. - From Review – Vigneshwaran G Mar 31 at 13:56

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