I think it's not unreasonable to need time to collect yourself, but the length of time you're suggesting is.
I come in from work sometimes and I can't handle any stimulus at all. When I feel like that, I say to DP 'I need - nothing'.
The TV goes off, he stops watching anything on his phone in the kitchen (or takes it upstairs), anything that's playing upstairs (how he manages to function as a human being with three sources of noise at once, God only knows) is switched off, all lights other than some fairy lights/kitchen cupboard LED strips are switched off and I either sit on the settee or, when I'm mega overwhelmed, go and lie down with all the curtains drawn and just try to stop thinking for half an hour. The most interaction DP forces is walking in quietly and putting a cup of tea down beside me before leaving again. He also puts in his wireless earphones so I'm not disturbed.
If I've been bellowed at, listened to 15 kids all playing drums at once, there has been shouting and general hassle all day from the Offspring of the Parish, I just can't handle coming in and having a conversation.
After that half hour, I'll emerge and normal service is resumed.
It's an absolute lifesaver at times.