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http://en.wikipedia.org/wiki/Molotov_Line
Assuming the Molotov Line had been completed by the start of Barbarossa, because say the invasion was delayed until 1942, what would it have taken to breach the line? It would have been a formidable obstacle to any invasion, taking weeks to fight through and probably resulting in high casualties and the expenditure of massive amounts of ordnance. Still, it wasn't a Maginot Line and once breached would probably trap significant numbers of Soviet troops to it. The question is how long would it take to get through, what would be the cost, and could the Soviets seriously stop or delay a German offensive with it?