First of all, I have limited time every day. MOre than two hours a day is virtually impossible for me, due to child care and work. So, making the most of my practice time, and doing it every day, is very important to me.
Here's how I practice now:
I have one main topic that I'm working on in terms of tone production/technique, and I try to stick with it for a long stretch of time. For me right now, that is preserving the contact with the bow into the string, using every point of the bow, with varying amounts of speed and pressure, across the entire range of the instrument. So I use:
-Every day, I make sure to drill some Sevcik variations (just the ones on one string) - I use the Reinke edition - this seems to be a good tool for making this concept "automatic", so the feel and sound of constant contact is carried over to the next etudes;
-Etudes - I try to make sure to always be working on an etude which is just at my level, but still challenging. I don't skip around alot, but try to apply that "connected" sound to whatever etude I'm working on. Right now, that's Storch-Hrabe #1. I move on when I move on. I also like to use Simandl's 30 and the Sturm.
-Scale Practice: two octave scales up one string as described here:
http://www.smithbassforums.com/showthread.php?t=87
-Vomit exercises - usually within one octave. Here I skip around, but try to focus on trouble spots. So I might start with fourth finger on third position D, and vomit up to every other finger using the A major scale one day. Then the next day might be something different - but always vomiting. Sometimes I just work on one interval, or one finger combination. It's always challenging.
-Orchestral excerpts: Trouble spots in pieces for performance. I haven't mastered how to do this yet, I just kind of look at what the orchestra's rehearsing next and find the trouble spots, repeat 'em, then play the whole thing in context. I want to add more "standard repertoire" practice, will start to add excerpts such as Beethoven 9 oratorio. Need lots of help with this, it's definitely the weekest area of my pracitce routine.
-Solo Repertoire -I try to fight the urge to just play solos all the time. So I focus on just one thing: e.g. tuning the double stops at the end of Kouss. mvmt 1. I usually want to play a whole mvmt or two from something I'm working on, warts and all, but I treat that like a "reward" for doing the other work.
-Simple songs from memory or method books. (ala Suzuki bass). I don't do this every day, but try to incorporate it as often as possible.
I never time myself, I just kind of move from one thing to the other before fatigue sets in. It works better for me to just know that I'm going to hit each one of those exercises every day, sometimes for just a very short time.
FWIW, I've been noticing great improvements in my playing since this routine has been established over the last six months or so.
I can't wait to hear some ideas from people with more accomplishments under their belt . . . good thread . . .