# Smart interval length

**URL:** <https://forum.xertonline.com/t/smart-interval-length/8636>\
**Category:** Support\
**Created:** [February 6, 2018, 5:11pm UTC](https://forum.xertonline.com/t/smart-interval-length/8636 "2018-02-06T17:11:45Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![aidencholes](https://forum.xertonline.com/user_avatar/forum.xertonline.com/aidencholes/32/60_2.png) [@aidencholes](https://forum.xertonline.com/u/aidencholes)\
**Post date:** [February 6, 2018, 5:11pm UTC](https://forum.xertonline.com/t/smart-interval-length/8636/1 "2018-02-06T17:11:45Z")

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Will a smart interval take longer if your MPA on the previous interval went deeper than the target MPA?

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**Author:** ![xertedbrain](https://forum.xertonline.com/user_avatar/forum.xertonline.com/xertedbrain/32/11218_2.png) [@xertedbrain](https://forum.xertonline.com/u/xertedbrain)\
**Post date:** [February 6, 2018, 6:27pm UTC](https://forum.xertonline.com/t/smart-interval-length/8636/2 "2018-02-06T18:27:26Z")

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Yes, if the interval is based on a Target MPA duration and it is a rest interval.

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**Author:** ![aidencholes](https://forum.xertonline.com/user_avatar/forum.xertonline.com/aidencholes/32/60_2.png) [@aidencholes](https://forum.xertonline.com/u/aidencholes)\
**Post date:** [February 6, 2018, 7:29pm UTC](https://forum.xertonline.com/t/smart-interval-length/8636/3 "2018-02-06T19:29:00Z")

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As I thought, thanks. Explains why my workout went longer than expected tonight. Next question: if a smart trainer is in ERG mode, how is it possible to deepen the MPA beyond the target MPA?

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**Author:** ![xertedbrain](https://forum.xertonline.com/user_avatar/forum.xertonline.com/xertedbrain/32/11218_2.png) [@xertedbrain](https://forum.xertonline.com/u/xertedbrain)\
**Post date:** [February 6, 2018, 9:12pm UTC](https://forum.xertonline.com/t/smart-interval-length/8636/4 "2018-02-06T21:12:31Z")

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Only through variations in power even though you’re in Erg mode. You’ll need to switch to Resistance mode if you really wish to dive deeper that what the workout has defined.