Typically, an indentured servitude agreement specified a certain number of years  The terms were usually from 4 to 8 years, so it's possible Patrick could have completed his contract term before 1708. At any rate, according to a Law enacted in 1705, indentured servitude ended at age twenty-four, (Hening. William Waller Hening. Hening’s Statutes At Large, Vol III, 1684 - 1710. Charlottsville, VA: University Press of Virginia, 1969. p. 447.) so he would have been freed from the contract no later than 1708 when he reached 24 years of age.

 

When a servant was freed, they were entitled to receive "freedom dues" from their master. By law, the freedom dues included 10 bushels of corn, 30 shillings or goods of equal value, and a musket or fuzee worth at least 20 shillings. (Hening. Vol. III, 1684 - 1710. p. 451.) (A "fuzee", like a musket, is a type of firearm. (Webster’s Third New International Dictionary of the English Language Unabridged. Springfield, MA: G. & C. Merriam Company, 1976.))