I imagine hospitals can be different in different areas. My boy was born 5 weeks ago and was in NICU for 10 days. Visiting hours on the regular postnatal ward were 9am-6pm, NICU didn't have visiting hours so Dad's could stay as much as they liked. It actually meant my husband could spend more time with us compared to being on the ward. This was all while I was still in hospital. If I had been discharged, we would've still been allowed to stay as long as we liked however if we left the hospital we wouldn't have been allowed to return that day. He was born around 9pm and I was rushed to theatre after the birth due to unrelated complications which then meant to wasn't allowed to be with him. They were happy for my husband to sleep in the chair next to him, as we couldn't imagine spending the first night with him alone.
I know you've mentioned a 3 hour restriction, but is this definitely for NICU or the postnatal ward?
I was able to be with my baby whenever I wanted, including the middle of the night. We were trying to establish breastfeeding so the nurses would phone me and ask me to come down when he started to wake, although I also provided expressed milk (after it took forever to come in) so he got a bit of both.
Hygeine was impeccable. Wash hands and arms before entering the ward, using hand sanitiser every time before you touch baby, although this may have been in practice even before COVID. We had our little corner of the room and as long as the nurses weren't in our area, we could sit with masks off. If a nurses or Dr came over we would put our masks on.
We unexpectedly had to go to NICU so didn't have a chance to find out about things before. It's good that you're getting prepared. Our NICU had leaflets with all the COVID related rules on the ward, which was provided as part of an information pack at the start. Is it worth speaking to them to get an understanding of what it will look like? Remember that things came change at any point.
It's an unsettling time, but honestly, trust in the nurses, I don't know how I would've gotten through those 10 days without their support. Your baby will be in the best place. Remember to keep yourself well. Go back to your ward regularly for sleep, food and painkillers.