Can anyone give me sample code for timer in pic16f676

Hi i am new to pic programming. can anyone give me a sample code for initializing Timer 0 and making it run for 30 mins ? 
i have been working with a code which turns on a device for 30 mins, and turns off after 30 mins.

// CONFIG
#pragma config FOSC = HS // Oscillator Selection bits (HS oscillator: High speed crystal/resonator on RA4/OSC2/CLKOUT and RA5/OSC1/CLKIN)
#pragma config WDTE = OFF // Watchdog Timer Enable bit (WDT disabled)
#pragma config PWRTE = OFF // Power-up Timer Enable bit (PWRT disabled)
#pragma config MCLRE = ON // RA3/MCLR pin function select (RA3/MCLR pin function is MCLR)
#pragma config BOREN = OFF // Brown-out Detect Enable bit (BOD disabled)
#pragma config CP = OFF // Code Protection bit (Program Memory code protection is disabled)
#pragma config CPD = OFF // Data Code Protection bit (Data memory code protection is disabled)

// #pragma config statements should precede project file includes.
// Use project enums instead of #define for ON and OFF.

#include <xc.h>
#include<pic.h>
#define _XTAL_FREQ 8000000
int readAdc(int);
int feedback_5,mpr;
int swt_1,swt_2,limit;
int counter,counter_2,sec;

void main(void) {
   PORTA = 0;
   PORTC = 0;
   TRISA = 0b000100; 
   TRISC = 0b001111; 
   ANSEL = 0b11110100; 
   CMCON = 0x07; 
   ADCON1 = 0b100;
   RC4 = 0;
   RC5 = 0;
   RA0 = 0;
   limit = 400;
    
    while(1)
       {
        feedback_5 = readAdc(2);
        mpr = readAdc(4);

 
        
        if ((feedback_5 > limit)&&(swt_1 == 0))
        {
             __delay_ms(50);
            counter = counter + 1;
            swt_1 = 1;
        }
        if ((feedback_5 < limit)&&(swt_1 == 1))
        {
            swt_1 = 0;
             __delay_ms(50);
        }
       
        if ((counter > 4)&&(mpr > limit)&&(swt_2 == 0))
        {
            RC4 = 1;
            swt_2 = 1;
            counter = 0;
        }
         if ((mpr < limit)&&(swt_2 == 1))
        {
            RC4 = 0;
            swt_2 = 5;
        }
        if ((mpr > limit)&&(swt_2 == 5))
        {
            RC4 = 1;
            swt_2 = 1;
        }
        if ((swt_2 == 1)&&(mpr > limit))
        {
            counter_2 = counter_2 + 1;                          /// integer incrementing in each step to work as a timer.
        }
        if (counter_2 > 3000)
        {
            sec = sec + 1;                                             // function of timer
            counter_2 = 0;
        }
        if (sec > 50)
        {
            RC4 = 0;
            counter = 0;
            swt_2 = 0;
            swt_1 = 0;
            sec = 0;
        }
       
    }
}
int readAdc(int channel){
    int vol;
        ADCON0 = 0x81 | (channel << 2);
       
        __delay_us(20);
        GO = 1;
        while(GO == 1);
        vol = (ADRESH << 8) + ADRESL;
        __delay_us(5);
        return vol;
}

 
i have been using an integer to increment its value each time the code runs. but i think the timer is more stable and efficent for this use.gone through the data sheet. i dont understand how to initialize it.
can anyone provide me help with a sample code to run just the timer for 30 minits so that i can understand and update my code  ?

I think the timer0 on a 16F676 is an 8 bit timer not 16 bit.

The PIC16F676 is one of the more resource limited mid-range controllers that Microchip offers.
 
It has just two timers and neither has a auto reload function.
 
This makes it a challenge to code a long interval timeout that does not drift.
 
It seems unlikely that the Original Poster(OP) wants a long winded description on the use of fraction interval dividers to realize low jitter, zero drift event notifications.
 
It would be useful for the OP specify just how precise the 30 minute interval must be.
 
Is plus or minus one minute close enough?
 
Or does it need to be within one millisecond?