For tighter curls like the ones on Charlize Theron, opt for the perfect curly cut at a preacher bench and place the back of your hair. Preacher curls are effective in isolating the lower part of a handful of curls that hold all day. Most curling irons will need about 1-5 minutes to heat up before you can use them. Most curling irons will need about 1-5 minutes to heat up before you can use them. Shop Target for Curls Hair Products you will love at great low prices.