dosage for nicotine gum

The information I can find on nicotine gum says that if you smoke less than 25 cigarettes a day you should use the 2mg dose every hour or two. My question is this- I only smoke 10 cigarettes a day, and only in the afternoon/evening hours. Should I only be chewing the gum during the part of the day when I typically smoke, am I supposed to chew it every hour or two from the time I get up in the morning?

  Thank you