[AdamJoshua]

When I bought my St. Dupont the salesman told me to take the refill cartridge and hold it in my hand or under my arm for a couple minutes to warm it up before refilling the lighter, or it would take a while to fill.

I have also read where people would put their lighters (after purging the gas) into the freezer for a minute and then fill them. I've never done the freezer trick, seems like freezing the rubber seals inside the lighter and then putting pressure on them filling the lighter wouldn't be great for them. I tend to just heat the cartridge with body temp and let it sit while it fills.