Assuming the weather will be colder and most likely the amount of fuel in the float chamber will be lower than it was when the engine was turned off 7 days prior, I wouldn't be surprised if it takes a little while to fire up.
I venture to say there is still some ignition or carb tuning or even carb repairs needed, though.
I say that because, of what you said about taking 10 seconds to fire up today.
In 50 degrees, if I give the carbs full choke, the engine starts instantly....not that I always want it to.
If it has been a couple of days, I often just use the starter to get the oil pressure to register...then once it does, I pull the choke and let the engine start warming up.