Depending on a) How busy they are B) How active the PTO's are and c) Whether your application showed that you are correct for the job then it can be anywhere from a few days to a few weeks.
EDIT: haha just noticed that b ) (without the space) goes to B)
I'm sorry, i will look into your topic today. It is each PTOs responsibility to check the application and reply to an application when they find an applicant they see fit to train., and sometimes... we get alot of applications that the old ones simply disappear into the void of page 2 that nobody looks at... yeah... our lazyiness affects new applicants... sorry! I will have to bring this up with the other PTO's