I went for a walk with Nature Society and one of the participants mentioned that her elderly mum walked out of SNEC specialist clinic after hours of waiting. Yeah, it is true, the average waiting time is at least 2 hours even with appointment. It is not uncommon to spend at least 4 hours at the clinic if they send you for test(s).
I have been going to SNEC regularly this year since I was diagnosed with Glaucoma. I can verify that even in specialise clinic, the patient load is very heavy. So one can image what happens in the polyclinics.