Conversation so far:
When was George Washington a surveyor?
George Washington spent a month in 1748 with a team surveying Fairfax's Shenandoah Valley property. He received a surveyor's license the following year from the College of William & Mary.
Where was Washington a surveyor?
Fairfax appointed George Washington surveyor of Culpeper County, Virginia.
What is Mount Vernon's relation with George Washington?
George Washington inherited Ferry Farm and ten slaves; his older half-brother Lawrence inherited Little Hunting Creek and renamed it Mount Vernon.
Did George Washington go to school for surveying?
Washington did not have the formal education that his elder brothers received at Appleby Grammar School in England, but he did learn mathematics, trigonometry, and surveying.

Question: How long did he do surveying?
Self-contained rewrite: How long did George Washington do surverying?