About time?? Numerator finished and asked the professor to return before he regretted everything, and sent them all to a bottomless pit, a repeating decimal. A student seated behind Caius sighed in relief because they had missed that subject, and muttered, “About time! We’ve managed to survive this class, but I dread to think what they’re gonna do with us now.” After the last lesson, Denominator thought the lessons had been enough to discipline the students and proceeded to explain their next task. I would like to know what does "About time" here mean. Thanks.