# Black screen random time presentation

**URL:** <https://discourse.psychopy.org/t/black-screen-random-time-presentation/23278>\
**Category:** Builder\
**Created:** [May 31, 2021, 6:30pm UTC](https://discourse.psychopy.org/t/black-screen-random-time-presentation/23278 "2021-05-31T18:30:05Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![JensBoelte](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.psychopy.org/jensboelte/32/9060_2.png) [@JensBoelte](https://discourse.psychopy.org/u/JensBoelte)\
**Post date:** [June 1, 2021, 7:32am UTC](https://discourse.psychopy.org/t/black-screen-random-time-presentation/23278/2 "2021-06-01T07:32:22Z")

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Hello R\_Lus

random durations have been discussed before. You might want to see if you could use this approach?

> [@Randomize duration of a Routine in Builder](https://discourse.psychopy.org/t/randomize-duration-of-a-routine-in-builder/21436):
>
> Hi! Participants are presented with pictures and then fixation cross. I need to set duration for the fixation cross from 3 to 3.5 seconds. It should be random each time. I am a complete newby in Python and already tried several codes proposed on the forum. Unfortunatelly, they do not work for me. Could someone suggest a solution?

Best wishes Jens

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