Is 10 minutes long enough?

Ok, I decided to just dye my hair darker and see what happens. I bought revlon colorsilk in light plum brown. It says to leave it on for 20 min. I did a strand test for 15 min and it looks pretty dark. Do you think if I only left it on 10 minutes that would be long enough for the color to develope or would  it turn my hair orange or something because it wasn't fully activated yet?

My roots are very dark brown about 2 inches down and the rest is light brownish blonde. (Not intentionally!) Bleached from the tanning beds I go to. The hair other then the roots don't take color very well but  since the plum brown is a dark color maybe it will work. I don't want it super dark as in almost black. that's why I was wondering if it would take if I left it on only 10 minutes since 15 minutes for the strand test was dark. I guess I could just do it and shampoo the heck out of it to hopefully lighten it a tad. I just want to know if 10 minutes would really give it enough time to even stick to my hair. If not then I'll just have to go longer and hope for the best. I'm on vacation so if it looks really bad I have a week to do something with it.

you know amber that you should always do midshaft, ends and then roots but it sounds like your length is over pourous and it grabbed to much of the color...that makes that drab over dark look....you could use some good conditioner on your hair, let it sit for 30 min to an hour and rinse....what i have had happen is that dye comes out a bit when you do that....the deep conditioning open the hair shaft enough to let some of the darkness out...at least that has been my experience.  good luck.

oh, don't i know what you mean!!  THE PERFECT COLOR....you know what though?  i think i found it in that shades eq....that stuff is amazing but will go dark so you usually put 2 shades lighter than target color....that schwarzhoph stuff that is like shades eq is good too...i use their shampoo,  BC for porous hair....made a diff the very first time i tried it and i use the conditioner too...also wonderful.

listen, just when you shampoo it feels like it has been conditioned....my hair got porous because of my perfect color search....definately get the shampoo and cond...highly recommend....i don't do that unless something is exceptional.  let me know.