The heating time is among the most common considerations when trying to find the best flat iron. To some people, this aspect is irrelevant. Whether the flat iron heats up in 30 seconds or 10 minutes, it is not important. However, chances are you will face a series of emergency situations – going out on a surprise date, heading to a party after a long day at work and so on. The flat iron is supposed to heat up almost instantly – less than 20 seconds anyway. Fortunately, such quick features will not necessarily add to the price either.