Why such a long period of fundraising? Do you doubt the success of your project?
Well, lot's ICOs offer Presale, ICO Round 1, Round 2 and so on.
We decided it would be best to run one ICO, for 2 months. We believe in the project and want to reach as many people during the ICO as possible. Furthermore lot's of potential investors don't simply send you their coins, they want to discuss the background, get more informations, discuss the invest with their team, and so on. So i think two months is a good timeline for an ICO.