I'm impressed by the speed at which bk is writing but I don't think he will beat the speed of the British writer Donald S Rowland. He usually began writing a book on Monday and finished on Friday. He wrote and had published over 500 novels in 25 years up to 1983, under not only his own name but also under about 70 aliases. He eventually burned himself out - not surprisingly - when he was in his mid 50s and found he just couldn't write anymore.