You may sell them within 6 months. If you invest in open ended equity diversified fund (except Tax Saving fund) you may sell the units anytime.But you have to pay exit load which is 2.5%.
But remember that if you sell within an years time of purchase of units then you will have to pay Short Term Capital Gains Tax @ 10 %. Also remember that Equity funds should be held for long period that for over 5 yrs time if you want to create wealth.