If the ascent begins with stairs it is only for about a third of the way, then the path is more rugged and ropes are stretched to help you climb while rangers are also stationed at the the most difficult parts. The last part of the ascent is more climbing than trekking. Going up this mountain is therefore not for everyone. As far as I'm concerned, it took a little less than an hour to reach to the top.
See here a list of accommodations close to Khao Lom Muak mountain
To go visit Khao Lom Muak mountain, you can also book one of the tours above.