Don't mean to brag but I can write 1.5k words in 40mins.
Proof: I've written 1240 words in 33mins 30 seconds. I have an audio of me doing it. You can hear the pen scratching. (I record my essays on my iphone at writing speed. It makes it easier for me to memorise)
so w8 lets do some maths 1240/(33*60+30)= 0.61691542288 words a second avg
therefore I can write 0.61691542288*(40*60)= 1480.59701491 words give or take a few in 40mins.
Honestly its not that hard,
good pen, hardwork in memorising and constant time watch.