As with all spells, as long as you are true of heart, they will work. The length of time for them to work, depends on many things, but foremost is that you use the right items, and that you have all the facts, if there is any doubt when casting a spell it won.t work the way you hope, and if your intentions aren't true, you can be repaid back 3 x 3. Remember the Wiccan Rede "Hurt no-one"
what did you mean above when you said "The length of time for them to work, depends on many things, but foremost is that you use the right items". My questions is what do you mean by "the right items" do I need to collect certain things of that persons to use in the spell?
Thanks for the question. For this particular spell, you really only need a picture or item from the person you are casting the spell on, although I always suggest burning some of your favorite incense, and a blue and white candle. I hope this has answered your question.
The auction is still going on, but if you need it at a later time, just drop me a line, I always happy to help. As for the candles, cheap ones from the a "dollar store" will do fine.