I was at Coffeebean Bishan Junction 8 in Nov last year, lots of students were hogging the tables, one couple even had a stalk of flower in a water bottle on the table as decoration - very comfortable. They even blatantly left coffeebean with all the books on the tables & left for dinner, (I was there for about 30mins - which should had been too long for their toilet breaks)
I asked the staff why they allowed the students to study there the whole day; answer was they were also paying customers. Yeah right, buy one drink, finished halfway so that it could not be cleared away then study whole day, when tired, just surf internet or sleep. What about other paying & dining customers?
For every pair of students, they occupied two tables/four chairs. That's how much turnover they had lost per student couple.