Its like if you leave from lhr to NA at 6pm on friday then you will end you gonna reach naran at 7am on saturday....from there you will reach hunza at max 6pm with small stay at naran, lulusar and babusar....stay at hunza
Now sunday depends on you....you can visit khunjerab (attabad lake on the way and passu) or visit naltar valley....and monday will be your way back to lhr (but it will be a long long travel)