When I'm mixing drum & bass or dubstep it's usually 2 - 6 minutes per track including mix in and mix... just depends how much I blend it, which with D&B is usually a lot (I'm finding it increasingly rare that I only have one track playing).
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I let this play out for the entire 15 minutes :
http://www.youtube.com/watch?v=CitwdkKB-oY
http://www.youtube.com/watch?v=Vf68m5AnGRA
Then I play the entire b-side.
i do a lot of layering with dnb, sample decks have made this more interesting, drop a 2 beat loop, copy to sample, then i have buttons mapped for halfing loop size and resetting it (with phase sync trigger mapped onto reset aswell). great for an extra build up, bring down to near 'micro loop' speeds + drop filter over main track at same time and reset everything :D
dubstep i find i have to leave a while, wait til a break down, loop a section, then drop a filter 92 lfo and iceverb for a wobble/build effect and bring in next track under it. that or play til the end almost. depends on the track really.
don't play much dubstep though, use it as section between breaks and dnb (maybe with some drumstep to). or sometimes drop one dubstep between a couple of breaks tracks. basically it's a 'tool genre' for me.
I haven't changed my opinion since the last time this question was asked
You should practice with trance if youre a beginner. It's built to play the whole 7-8 minutes for the most part. It can be just as hard to mix as any other and usually allows for longer smoother transitions, but because the songs are made to not get so monotonous after the first 30 seconds you have plenty of time to think about what your plan of action will be for the next track. Also the music is more beautiful and gives different emotions rather than just "whooo party!" (in my opinion)