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Are you aiming at burning fat? If yes then do interval runs with mixed speed/incline, make sure you run not less than 30 minutes as body starts burning fat only after 15-20 minutes of work out.
If you're just working on improving your stamina you can increase time little by little with each cardio work out, make sure you don't run fast.
Walking long distances with high incline is great cardio work out as well, many say it's even more effective than running and safer for your heart.
Personally I like mixing all of the above up, not within one work out, but let's say if today I don't feel like running I'll do walking with high incline or elliptical work out.
The most important - listen to your body and control your breath and heart rate.
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