[tor-relays] uptime and connections for my middle node relay

Hi, I am running a relay about 5-6 weeks. I have read the 'lifecycle-of-a-new-relay' and I am not over the 86 days, but I still wonder me, at most, I have only inbound connections. Sometimes outbound too, but rarely. Can someone tell me why?

And I have another question: Can someone tell me how many hours a day uptime is minimum requirement for a standard middle relay? I have reed many posts, but there are not a exactly answer.

Sorry for my english ... greets Malte