# How accurate preform time is?

**URL:** <https://forum.formlabs.com/t/how-accurate-preform-time-is/30276>\
**Category:** Form 3/3+\
**Created:** [February 17, 2021, 5:43pm UTC](https://forum.formlabs.com/t/how-accurate-preform-time-is/30276 "2021-02-17T17:43:08Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Creative3dminds](https://avatars.discourse-cdn.com/v4/letter/c/ea666f/32.png) [@Creative3dminds](https://forum.formlabs.com/u/Creative3dminds)\
**Post date:** [February 17, 2021, 5:43pm UTC](https://forum.formlabs.com/t/how-accurate-preform-time-is/30276/1 "2021-02-17T17:43:08Z")

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Hi ,

Why preform time changes every time when i click on the Print Time ? With generated support first the time was 6 hrs (50microns) but when i am clicking on Print Time its showing 4h 45 mins. which one will be the actual print time i am confused. Any idea ?

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**Author:** ![DKirch](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/dkirch/32/20300_2.png) [@DKirch](https://forum.formlabs.com/u/DKirch)\
**Post date:** [February 17, 2021, 8:39pm UTC](https://forum.formlabs.com/t/how-accurate-preform-time-is/30276/2 "2021-02-17T20:39:53Z")

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Hey @Creative3dminds!

If it’s not too much trouble, would you mind posting a screenshot or two of the different estimates? That might make it easier for me to identify the culprit in your specific case.

It’s not uncommon for estimates to adjust a little as you re-generate supports/orientation, and 4:45 vs. 6:00 isn’t the widest gulf I’ve heard of, but it’s definitely a decent difference.

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**Author:** ![Creative3dminds](https://avatars.discourse-cdn.com/v4/letter/c/ea666f/32.png) [@Creative3dminds](https://forum.formlabs.com/u/Creative3dminds)\
**Post date:** [February 18, 2021, 5:13pm UTC](https://forum.formlabs.com/t/how-accurate-preform-time-is/30276/3 "2021-02-18T17:13:42Z")

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Hi

Here are some screenshots – I just open one form job file in preform software (See the time in 2nd screenshot) and then i just rotate the viewport and click on the Print time (see the time in 1st screenshot) so i just want to ask why this much difference is coming ?

 ![2](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/3X/8/7/87fb6feef3135f8b5c731dc216f3a64fa747ebf9.JPG) ![1](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/3X/6/5/6564c22e4794f4916c65cbad3c4878f896eb3c40.JPG)  
Thanks