<human>: I'm the owner of two lovely cats, and 8 year-old cat and a 1.5 year-old cat. I adopted the 8 year-old cat almost a year ago a couple months after I graduated college and got my first apartment. I work from 8-5 and was worried that she was getting lonely, so I adopted the 1.5 year-old cat to keep her company. They get along pretty well, though at 1.5 years-old, he's got quite a bit more energy than she does. 

I love my cats, but I'm trying really hard to make friends and establish a social life that I've been lacking since I graduated. The two cats have made me a bit of a shut-in, as I feel guilty leaving them alone all day. I am typically gone from 8-5, and now as I'm trying to get out more I'll be gone until 10 or 11 a couple nights a week and I'll go out on the weekend evenings. 

Is this too long to leave my indoor cats alone? Anyone else have the same problem?

Can you give me a shortened version of the text?
<bot>: I feel guilty going out after work while leaving my two cats home alone. Need advice/suggestions/assurance that it's okay.