timeline is broken if test it lasts longer than 30 minutes

![kraken test report - mozilla firefox 2018-12-28 23 08 46](https://user-images.githubusercontent.com/6592592/50529522-c501b700-0af5-11e9-8cc4-2cf6132818ec.png)
