If you are planning by road it takes 14 hours drive. Another way is via Jammu where there is a flight to Leh kushok bakula rimpochee airport. But for this, you need to travel from Manali to Jammu then take the flight. By train again only till jammu tawi station trains run. By bus JKSRTC operate but from Kargil. Kindly do recheck the above once more before booking for they keep changing due to travel restrictions.