How much tv time is safe for 12 month old?

I hardly ever put the tv on for him. But lately ive been overwhelmed and exhausted. I feel like I have PPD. I feel like I’ve had for months now. It’s getting worse. I find it hard to get everything done during the day (play with baby, cook, clean, etc.) putting the tv on just helps me.

I feel like a horrible mama for doing this though. So please be honest, how much is ok?