When we export data from Jira Issues, we have a column named Original estimate

R_rqa8m6

When we export data from Jira Issues, we have a column named Original estimate. I understand the meaning of this column but I can't guess the units use

For exemple, on Jira, the original estimate is 1d4h but in the excel download its 43200. But it's not corresponding with a conversion in minutes either in seconds

Nic Brough -Adaptavist-

Welcome to the Atlassian Community!

It is actually seconds, but not just plain seconds, it's taking into account your settings for time tracking.

With 60 seconds in a minute and 60 minutes in an hour, you can convert to hours by dividing it by 60 twice (or by a single division of 60*60)

So, 43200 / 3600 = 12 hours.

I think your time tracking is probably the default of working time is "5 days a week, 8 hours a day".  In those terms, 12 hours = 1d 4h...