Time limit in police station

it all depends on the offence and how early you come to police station to report your complaint, if late complain creates suspect and lowers its weight 

For FIR, it is SIXTY DAYS as the standard but upon court order or senior police officers' instructions, even

beyond the sixtieth day, an FIR can be registered.

Please note that FIR need NOT be registered if the I.O. ( Investigation Officer - Police Inspector - Station-in-Charge ) feels it is not 

required......In that case, you need to meet his higher-up ( ACP or the DCP and higher )....or the courts ----

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 Investigation : If an incident occurs, you are advised to file a complaint within 24 hours....from the

moment your complaint is filed, the police too is advised to begin the investigation within 24 hours....

They usually get started immediately since in court, the advocate might accuse the police of waiting

intentionally without investigating, so that the accused can escape and that the police and accused are

hand-in-glove with each other.....