Conversation so far:
What was the Orangi Pilot Project?
The Orangi poverty alleviation project (known as the Orangi Pilot Project, or OPP) was initiated by Khan as an NGO in 1980.
Why did he start it?
The project proved an impetus to the socio-economic development of the population of the area.
Are there any other interesting aspects about this article?
Orangi is located on the northwest periphery of Karachi.
Why did Khan start the OPP?
At that time, it was the largest of the city's approximately 650 low-income squatter settlements (known as katchi abadi).

Question: How long did the project run?
Self-contained rewrite: How long did the Orangi Pilot project run?