Hi, you should plan for a 10 day Delhi-Manali-Leh trip. The best time to do this trip is from end of August to mid-October. It will take you two to three days to reach Leh from Delhi depending on how long you drive for. You can spend the first night in Manali and second in Jispa. Reserve five days for Leh and surroundings. The places to visit in and around Leh are Nubra Valley, Turtuk, Pangong Lake, Khardung-La Pass and Hemis. For your return trip you can either backtrack the same way you came or go via Srinagar. Places to visit in and around Srinagar are Dal Lake, Shalimar Bagh, Nishat Bagh, Gulmarg and Sonmarg.