Depends on your hair, but if your hair get relaxed for example in 20 mins., then texlaxed hair should be about 10-15 mins. I also think it's best to get better results if you use a lye because lye takes long naturally to get relaxed than no-lye. Also if your doing on your own for the first time you should add about 1/4 a cup of oil, or conditioner to slow down the process.