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Nazy,
The two main factors that influence how long an Analyze job runs are 1.) the number of logged queries; and 2.) the average size of the logged XML files. So the size of the TDStats tables is less critical to performance.
A couple of things that might help you speed up Analyze are eliminating XMLPLAN logging (which is only secondarily important) and limiting the range of dates upon which analysis is being performed. Those are good generalized recommendations.
There are a couple of DRs that will further to reduce Analyze time. As you have an incident open, I'd suggest you work with the GSC to get these fixes. Sorry, I don't have the DR numbers.
Thanks, -Carrie