F150online Forums - same crank speed, longer time to fire

I'm wondering what I need to be on the lookout for with my 99. 5.4, 167,000 miles. It's been single digit temps where I live, and the truck has been taking a little bit longer to fire. Everyone has that clock of how many cranks it takes to fire, and mine is taking at least an extra second or two to get ignition. Cranking speed is good, no trouble codes per my gryphon. I know it can take a bit longer after sitting out all night, but it seems like it should fire a little quicker if it has been parked for only an hour after driving for 45 minutes. I could be paranoid, but I don't like when things aren't normal. Thanks!