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In the US-Egypt treaty, there is a condition that a person should come to the US for a period not expected to exceed 2 years. Is this decided based on the visa duration, the initial guaranteed contract, the project expected duration, the petition of the work visa, or what?

Here is the text:

Where a resident of one of the Contracting States is invited by the Government of the other Contracting State, a political subdivision, or a local authority thereof, or by a university or other recognized educational institution in that other Contracting State to come to that other Contracting State for a period not expected to exceed 2 years for the purpose of teaching or engaging in research, or both, at a university or other recognized educational institution and such resident comes to that other Contracting State primarily for such purpose, his income from personal services for teaching or research at such university or educational institution shall be exempt from tax by that other Contracting State for a period not exceeding 2 years from the date of his arrival in that other Contracting State.

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