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There are a few things that can cause this.
Before the injectors will turn on the ECM has to see a few thousand PSI in the fuel rail. If pressure is building slowly because of a weak high pressure pump, a weak transfer pump (inside the high pressure pump) or one or more leaking injectors then it will cause this.
More common though is a loss of prime on the supply side of the fuel system. If fuel drains out of the lines and back to the tank as the vehicle sits then it will be hard to start because it has to draw fuel back up from the tank.
The most common cause of a problem like you're having is a bad fuel filter mount. This contains the fuel heater and also the primer. There were some issues with the primers not sealing and allowing fuel to drain back causing hard starts. They were revised for this problems and I haven't seen one of the new ones cause an issue.
I've also seen fuel filters vibrate loose enough to cause fuel drainback but not leak enough fuel externally to drip on the ground.
If the filter mount is original and not the revised one then I'd recommend replacing it.
If that doesn't take care of it and a line issue is suspected then I would do a vacuum test on them to see if they'll hold vacuum, if one of them won't hold vacuum then you know it has a hole in it.
If you can get it to where you know fuel isn't draining back yet rail pressure is slow to build on startup then the injectors should be tested next, if they are ok then the high pressure pump can be condemned. These engines hit the US market almost nine years ago now and I can't recall ever having to replace a high pressure pump.