This topic is one of my favorite / so thanks for asking!

The last couple of month I have just got an average of 30 - 45 minutes per day, which isn't enough for me.
However since I only focus on technique - more specifically the technical things that limit me, I find that I get a lot out of my practicing minutes. The downside is of course, that I don't have time to learn new stuff (30 - 45 minutes per day surely isn't enough for that).
Most people who have been at GMC for a while know what happens if you only practice technique - your musical ability drops and after a while you start feeling that you aren't capable of playing much other than your exercises.
The same is of course true for me - so what I do is to try to think of new songs, soloing approaches and even licks when I am not even holding a guitar. This will certainly not make me a better guitarist - but it does really help when I get the time to sit down and write a solo or song. Basically it gives me a home-built library of inspiration to choose from.
This approach wouldn't work unless I got that minimal amount of technique practicing (If I didn't do that I wouldn't have any chops to play my accumulated ideas).
QUOTE
do you practice numerous of different techniques or do you only practice a few exercises a day
More specifically - I practice
* vibrato (at speeds and strings where I am not comfortable),
* I practice left hand strength/legato (with finger movement and stretches where I don't feel comfortable),
* and I practice speedpicking tone (basically slowing down alternate picking exercises and making sure every note sounds the way I want it to).
Let me know if you have got any more questions!