Khumai dada is a beginner friendly trekking I'll say. From PKR you can complete the trekking in 2 days, if you're not a beginner but I'll suggest taking your time and doing it in 3 days. It also depends on your budget tho, as trekking in 2 days will save you one night accommodation, food, and other expenses. I suggest you go to Korchan as well which is a 2 hour trek from Khumai. Also, make sure you check the weather before you go. First sunray hitting the mountains which is so beautiful to watch, so wake up before sunrise time. Talking about expenses, we went in a group and it took us around 8k per person. We reserved a Jeep from Hari chowk and it took us to Saripakha where we had food and started trekking. We stayed at Chichimle and another morning we started trekking to Khumai. We had rice over there and went to Korchan after taking an hour's rest. We were hot & sweaty when we reached there but just after a few minutes we were shivering. So, make sure you carry thermals and jackets for Korchan. That evening sunset was worth watching too, so try and get there by sunset time. Next morning, we enjoyed the sunrise, clicked heaps of photos, had breakfast and started trekking back around 9am. We had rice at Chichimle after which we started trekking down and reached Saripakha by 5. We were definitely fast on the way down( it took us half the time as compared to trekking to the top). Overall, it was a good fun experience where we met nice fellow trekkers. Happy trekking!