Yes a very common issue for a hard start that the filter primmer pump is the problem .
If after the first start and then you switch off the engine and 10 minutes later starts up no problem
then this could be your problem.
What you can do to test this :
First thing in the morning with a engine that has not been starter for over 10 hrs .
Pump the primmer pump 40 plus times or until you fill the pump is hard ,
then try and start if she starts up faster than normal replace primer pump as the one way valve has failed.
still having the same problem test the glow plug system.
For further assistance with this issue please get back to me with the reply box below .
This is not a one answer and done i/we will stay with you until the problem is sorted out .
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Kind regards Greg..