1: Washing your hair is not a quick 5 minute job. It takes time to work up the energy to do it, never mind actually doing it.  2: Dry shampoo is your friend throughout the week, but you need a permanent supply because standard bottles last a matter of days.  3: Whacking it up in a ponytail isn’t as simple as it sounds. There are so many factors to consider. Hairbands that can take the weight, the right angle so you don’t feel like you’re…