Hi JJ, the Tiong Bahru clinic opens only on Mon and Fri and their last appointment could be 4.30pm. If you prefer, he has another one at Paragon (bigger space) which operates on Tue, Thu and Sat (1/2 day). Both clinics do not offer night consultations. Even if the clinic is "closed" for consultation, there will be someone to take phone calls from customers who wants to make appointments at the respective clinic.
Yes, usually I'd take half day leave cos his schedule is so packed! I'll try to ask for lunch hour to save leave but sometimes no choice loh.. have to take leave. Alternatively, you can ask Dr Fong for an MC hehe, but I think he charges $5 for an MC.