If it was the fuel filter, then he would have driveability issues as well.... loss of power, stalling, rough running, hesitation, etc.
I'd probably check the fuel rail and see if there's a pressure leakage (whether external or a defective check valve of sorts). If there's a slow leak, there might not be enough pressure during cold starts, especially if the car has not been driven for a while. That might explain the need to crank the engine longer to build up the fuel pressure.
Then again, it could just as well be the glow plugs. It's worth to check them out too. In fact, I'd start there.





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