It took my mature female Chilean Rose almost 8 hours to molt. Don't be concerned yet, just make sure the humidity is up a little and let nature take its course.
Sometimes it just takes a little while.
Also, don't disturb yours, just keep an eye on her to look for potential problems (legs stuck, etc.)
longest record here was 28 hours..if you can believe that! and it was my FIRST spider..I'd had her all of 6 DAYS!
A seemanni from Petco, poor thing, I ended up intervening, having not a clue what I was doing, but probably with my bumbling, and help from friendly T folks, saved her life. She only lost her left palp, and regenerated a rather spindly looking one last molt