According to my calculations if you are very heavy and it's a hot day it will take you about 10 NM to climb to 1500' AAL
VERY optimistic ...
MGTOW for the 727-200 with the 14,500 thrust engines. It took 31 miles to reach 1,500.
I have a relevant AFM in the files somewhere but I don't think I'll go searching. This is a bit more realistic. Now, if you go to the twins, where things are abysmally worse .. it can be a LOT more .... DC9, for instance, with a long third segment .. could take 50-odd nm. This is why we continually keep pushing the "don't try to wing the obstacle clearance visually on the fly ..".
And here's me thinking you guys could leap tall buildings with a single bound.
.. that's a skill reserved for you flingwing folks ..