Display age of a card in column and have its visible attribute change if waiting longer than task's estimate
Ability to see the age of a card in a lane and have its color or some visible attribute change if it is sitting longer than the estimated time for the step or some visible flag to attract attention. Currently, when there are a large number of cards on the board it is difficult to find the ones that have been sitting for too long.

Hi All,
This feature is already provide in the tool couple of releases back.Please refer the below link for details.
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Gabriel commented
It would be good to display the number of days a card has been in a particular column.
We currently mark our physical board with a tick (red tick for blocked days) each day it has been in a column.
It would be good to display this information on our SK board too.