For 1 pound, it needs = 30 min. cooking
so, for 4 pound, it is = 30 * 4 = 120 min. cooking.
Now, 15 min. for rest, so total time needed = 120 + 15 = 135 min.
If you need it at 6:00 PM, then you should put it into the oven at 6:00 PM - 135 min. = 4 PM - 15 min = 3:45
In short, Your Answer would be 3:45 PM
Hope this helps!
