Is it normal for hair to get greasy after one to two days?

Yes, if you have oily hair. For some people, washing hair too often strips away hair’s natural oils and cause excess oil production. To keep your hair looking shiny and clean:

• Choose the right shampoo for your scalp condition
• Use conditioner and styling products (gel) sparingly
• Wash your hair every 2-3 days instead of daily unless you live in a humid area and sweat a lot
• Wash your hair with warm, not hot water

For more information: http://www.wikihow.com/Keep-Hair-From-Getting-Greasy