Why does it take so long to start up my iMac

it is taking so long to start up my imac    why i do not know?  can anybody tell me why

'so long'...?
Minutes? hours? days?
Time is relative in this respect.
In any case, check your system.log after a reboot. It will contain a slew of timestamped startup messages showing what the system did during startup. Look for error messages or steps that take a long time to execute.

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