Can I change the color of the accumulated time bars?
One answer
I don't think this feature exists. The progress bars and load bars show pre-programmed colors to express different information. See here: https://jazz.net/library/article/586
If you wish to raise an enhancement you can here. But you should take time to understand how the time bars work and be specific mentioning which exact plan type and bar type etc..
RFE Community
https://www.ibm.com/developerworks/rfe