Blasterqueen: hmm only a faint smell, it's not like a bleachy smell or anything, just a chemical one, reminds me of the smell you get from a bottle of pills.
Sazeus: I left em all out for about 7 hours, but some things (like one of the Dreamcasts) were done in an hour or two. The recipe I followed used a much higher strength of hydrogen peroxide though. Saturday was very overcast most of the day too, but this time of year we get a lot of UV anyway to help the reaction.
Miles: I left everything assembled, which means you need to be very careful with the cleaning off of the stuff later on, but I much prefer that method to completely disassembling as the Retr0Bright is a paste and is easy to apply to the areas you want it on specifically. I used three different cloths (each getting progressively dryer) to then take it all off, which wasn't too difficult.
Rock On.