How fast should units turn upon a tenant leaving?

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For those that are working with a property manager on smaller projects - say under thirty units - 

 I had five tenants vacate without notice from my 16 unit building.  This was ok because we were just about to start the eviction process because none of them were paying, and they had a bad influence on the overall community.  Once they were out the plan was to fix up the units and increase the rent by about $100/mo to get them inline with the market.  

The property manager has done a good job at saving money at ever step of the way, paint vs replace, negotiating payment plans with contractors to stretch out the cashflow etc.  But, it seems to have taken alot of time for the process to happen.  There is one company for paint, another for carpet, another for kitchen, etc.  It took about three months total to get the contractors lined up, work done, and per the PM, the units should be rented by the end of this month. 

This is an established property management company in the area.  So my question is - am I being too patient or does flipping this many units at once take this much time?