You can do half an hour as long as you focus on compound movements and you superset things...
Example:
1 set of 8-10 bench presses
1 set of 8-10 machine rows
Repeat that 3 times
1 set of 8-10 shoulder presses
1 set of 8-10 pulldowns
Repeat 3 times
Etc...
You'll work out your arms as well as your bigger torso muscles by doing exercises that involve movement at both the elbow and the shoulder.
Edit: Couple things I forgot...
-Since you alternate muscle groups by supersetting, you don't have to rest very long between sets, so you can go faster (the pushing muscles rest while you're working out the pulling muscles).
-You can switch it up on the # of reps. Try increasing weight & decreasing reps or increasing reps & decreasing weight. Variety is good.
-Use machines or freeweights (I'm a fan of free weights, but it won't make a huge difference in this type of application)




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