What is the life (hours) of a fuel injector and gloww plug my tractor 1800 hrs and 10 yrs old ?

Don't know if there's a set time.
I work on tractors all the time that are 20 - 30 years old , that still have the factory ones in them .
Luck

Thank you my kubota BX just stopped running,it cranks OK but that's it ,I teated and cleaned ev and bleed everything stille the same also changed the fuel.but one more thing might be it air in the engine,so today remove glow plugs hand turn the engine to expel air or water, frustrating thanks again

Glow plugs would be the first thing I checked . Make sure there heating up.
Luck

Thank you,I think as last resort it maybe the injectors,I pull one of the injector and couldnot force air through it everything is clean and bleed new fuel cranks good .I am going to replace all 3 injectors and 3 glow plugs

You shouldn't be able to blow air threw the injecters.
They don't pop off until about 2000 psi.