When should I reach out to my autistic boyfriend who asked for space?

My (33F) boyfriend (40M) (4 years together, long-distance, different countries) is autistic and struggles with communication when he’s overwhelmed. He’s been out of work for the last 2 months and has been stressed. We talked on the phone last Friday but it ended badly.

I asked him when he was coming up to visit and he got frustrated at me and said he couldn’t plan anything and he’s overwhelmed (I travelled a lot to him over the past couple years but have been dealing with my own health issues). He told me that he’s moving back to his old city to get part time work. I’m supportive but kinda hurt so I messaged him after about wanting more consistency with visits and he replied saying he needs a few days. On Tuesday, I msged him asking if he wanted to talk and he replied saying he’s anxious, needs space/quiet, but that he loves me. I told him I’d give him space, but it’s now Sunday and I haven’t heard from him since.

How long should I wait before reaching out? And how do I word it so I respect his needs but also express that I need some contact and communication too?