What factor governs the inherent, pre-calculated expiration date for space telescopes operating at Earth-Sun Lagrange points?

Answer

The finite amount of propellant carried for station-keeping.

Telescopes at L2 must use propulsion periodically to maintain their precise halo orbit; thus, their operational lifespan is directly limited by the amount of fuel they carry for these maneuvers.

What factor governs the inherent, pre-calculated expiration date for space telescopes operating at Earth-Sun Lagrange points?

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