How long could Georgia have lasted if Russia went all the way to Tblisi in 2008?

If the peace negotiations failed and the Russian military was ordered to topple Sakashvilli, how long could the Georgian military hold out ? would they battle street by street in Tblisi ? or retreat into the mountains ?
 
They would be fighting, but they wouldn't last long. Georgian land forces didn't do too well against Russia. (Unless those US advisors were still there- or unless Cheney got Bush to use force there.)
 
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