We tried to access the B Senator lounge today with an antigen test that was taken 47 hours ago. Unfortunately, the test had to be maximum 24 hours old. I was not aware of that, so there was no way we were allowed into the lounge. As far as I understand, all restaurants at FRA had the same 24 hour rule. We ended up getting take-away from McDonald's and eating at a very crowded gate. It was probably the most "crowded" meal I've had since the pandemic started.