I am thinking you mean last to MARK the entire quilt. I still love those blue mark - b- gone but they lose their marking capability quickly without a bit of a cap on recharge. Expect to go through several in marking one quilt. Green Fairy has blogged about that and Diane Gaudynski mentions it in her books too. So I do what they did. I dedicate 3 to 5 pens. I mark with one until it quits making a bright blue mark then switch to the next, capping the first one and letting it "rest", etc. I keep rotating them and I can usually get a whole quilt marked with 3 but I have several new unused ones in reserve. On one quilt I had to switch out again but I didn't start with brand new pens.