about 33-34 hours.
still remember that time was addicted to this manga I downloaded the scan from the net, keep read from 1 until finish .. haha.. in the end until 6 o clock just nice go to school liao, suay suay asked to run 2.4 .. felt like dying. then go back straight away drop dead like zombie.
Around 72 hours including the necessary toilet breaks/meals. And that was playing Final Fantasy V during the school holidays. Followed by two whole days of sleeping ;p Also tried keeping awake for around 48 hours continually reading novels 天龙八部，射雕英雄传，神雕侠侣 and 倚天屠龙记.