You don't give enough information about your route or your method of transport but getting from Calais to Saint Petersburg thru the Basltic States could be done in a couple of days (no fun because you would just be driving) or very comfortably 7-days
petrozavodsk doesn't look that far are not as bad as you might think but can have dreadful traffic jams due to roadworks or accidents (common)
If its a loop Finland is mostly flat and safe and then ferry to Danmark , Sweden- Denmark.
Very doable in your time but make a rough route on Google maps, look at times and then add about 50% for traffic delays and sightseeing
Enjoy your trip
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