Since you have ample buffer, check arrivals on WIMT or ntes app when you are about to reach NZM. Surely you will get EMUs for NDLS or some express train going for NDLs. If luggage will be more metro is not advised. Second option is cab but one can easily get train for NDLS from nzm when having such a huge buffer time.
please wait...Translate to HindiKyun Bhai, tere paas itni buffer hai, toh WIMT ya ntes app pe arrivals check karle jab NZM paas aa raha hai. Pakka milega EMUs NDLS ke liye ya phir koi express train NDLs ke liye. Agar bohot saara samaan hai toh metro nahi suggest ki jati. Doosra option hai cab lekin araam se train mil jayegi NDLS ke liye NZM se jab itni zyada buffer time hai.