Generally, whatever amount of time was waived when you were given probation.
Example: If your offense carried 5 years prison and you were given a year probation and you broke probation after 6 months, I'm guessing you would do 4 1/2 years in prison, or 5.
If the MAXIMUM time for the crime which you plead guilty of doing, or were convicted by a jury was 10 years, you could get as much as 10 years in the big house.
You might get a tongue lashing, and be sent on your way to try again.
Many wonderful, whacky things could happen, mate.
I suggest you request a public defender, and he or she will explain what risks you are facing.