This is a time lapse of a drawing i did a while ago.

it took 10 minuets to draw wich divides down to 600 hundred seconds. in time lapse the video 

lasts for 60 second and it was recorded at 25fps. so you d 60x25=1500. so there is 1500 frames in 

600 seconds so i divide 1500 by 600 wich means a picture was taken roughly every 2.5 seconds.