[jms_]

When it comes to startups I'm not sure you can prioritise things like this over actually working on your product.

Also, if you're measuring and refining your estimates, they stop being 'estimates' and become something far less useful. If you have problems with estimates being inaccurate, try not estimating.

There are far more interesting metrics to measure rather than flogging a dead horse.

[Mamady]

I agree - time tracking on a granualar level is very high friction and ends up being a waste of time. Better to focus on things that bring more ROI, like product.

Unless your billing on an hourly basis, chances are that counting hours is too much micromanagement.