long start when cold

[hummer_maxxer]

last couples night its been about -3 Celsius and when i come to start my truck it has to crank for about 5 or more seconds. if i let it idle for a couple minutes, shut it off and start it again it will start in a couple seconds like normal. but i let it sit for an hour or soo and same thing, about 5 seconds to start. any ideas?? both batteries are new and new glow plug relay. i was thinking new glowplugs or that maybe i was loosing the fuel prime????

[Visseroth]

Sounds normal to me, it's dang cold out there, you'd start slow too if you were cold in the morning.
Do you plug it in?