Approver groups: measure individual waiting times

[Sil]

Hi!

I am currently speeding up processes by making multiple approval parallel to eachother. Previously I made an SLA which timed from the moment the status was set to waiting on team xx (which was automated within the workflow). Once an approval was accepted or denied, the status would change (by automation) and the SLA stopped timing. 
Now I am going to send multiple approvals to different teams, which all need to approve in order to proceed. The previous SLA method can only measure the total time waiting for an approval, and not the individual time. For me it is useful to determine the individual waiting time per teams to discover bottlenecks. 

I am now using the group picker (multiple groups) field in automation to automatically request approval from different teams (depending on their status) 

Does anyone have any other approaches to this issue?

Thanks in advance!