Did about 100 miles in January with about 55-60 lbs on my back thru rough terrain. Pretty decent weight... I would aim for a nice round 40 lbs... All depends on your sleepign and food arrangments as that means tent/sleeping pad/stove/food weight...

Nicely paced 150 miles is about ten days walk. That should give you an idea how much food to carry or how much money you should bring. But 10 days worth of food is going to be a bulk of yer weight.