# Different time scales in ODE system

**URL:** <https://discourse.julialang.org/t/different-time-scales-in-ode-system/111030>\
**Category:** Modelling & Simulations\
**Created:** [March 1, 2024, 9:04pm UTC](https://discourse.julialang.org/t/different-time-scales-in-ode-system/111030 "2024-03-01T21:04:50Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Nick1](https://avatars.discourse-cdn.com/v4/letter/n/47e85d/32.png) [@Nick1](https://discourse.julialang.org/u/Nick1)\
**Post date:** [March 1, 2024, 9:04pm UTC](https://discourse.julialang.org/t/different-time-scales-in-ode-system/111030/1 "2024-03-01T21:04:50Z")

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Hi everyone,

I have an ODE system that involves reactions that happen in different time scales (minutes and seconds). I know I can convert all the ODEs to seconds but I am curious if there is a way to tackle different time scales in ODE systems to optimize it.

Thanks!

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<div class="post-metadata">

**Author:** ![ChrisRackauckas](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/chrisrackauckas/32/77_2.png) [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)\
**Post date:** [March 1, 2024, 9:08pm UTC](https://discourse.julialang.org/t/different-time-scales-in-ode-system/111030/2 "2024-03-01T21:08:57Z")

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Use a method for stiff equations.