Expiration date for image url

I use this request to get image URL

 https://graph.mapillary.com/[IMAGE KEY]?fields=thumb_256_url&access_token=[MY TOKEN] 

Later I have an error “URL signature expired” with this URL.

How can I get expiration date or what is current duration for expiration time?

Thank you for the answer!
My project generate static html with link to Mapillary image, so I can update it only when regenerate static pages. And my intention is to not get new URL each time when I regenerate pages.

As Mapillary members did not respond, I will make experiment to find this period.

The expiration time for image CDN URLs should be 30 days.

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