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I have been going to the gym for about 6 months now. Most of the time infrequently, but the last 2 months have been frequent. However, i had the idea i was overtraining. I was spending 2.5 hours in the gym doing all kinds of exercises. After reading this forum i decided to slash half of it and add some exercises. However, i do not want to risk overtraining again so i would like your opinion of the routine that i started doing to day.
First some personal info. I am 22 years old, 6.1 (185 cm) tall and i weigh 220 lbs (100 kg). My goal is to increase my lean muscle and decrease my body fat percentage. My current diet is low on carbs, high on protein and i try to stay around 2000, or lower, calories.

Now for the exercises:
Dumbbell shoulder press (3x8)
Hammer curl (3x8)
Bench press (5,5,5,3,3)
Squat (ass to grass) (5,5,5,3,3)
Heavy barbell rows (5,5,5,3,3)
Deadlift (5,5,5,3,3)
Preacher curl (3x8)

I wanted to add some dips (3x8) but that would take me over the 1 hour and 15 mins training time so i decided not to yet. Should i add them.

Thanks in advance for any sort of advice.

I forget to mention that next to this exercise i walk a lot. I don't have a car so i walk everywhere i have to go. This comes down to around 45-60 mins a day with maybe 2 hours in the weekend sometimes.

That's overtraining. Cut it down to 3-4 major compound movements tops, and zero, one, or two accessory movements.