The "Reload(instr. Cycle)" value is important for Long-Term accuracy.
It represents the number of Clock Cycles (instructions) that it takes to Reload the timer.

In the case of Elapsed_INT ... there are 7 cycles between the point where the timer is stopped until it's been reloaded and turned back on again.

Code:
; -----------------  ADD TimerConst to TMR1H:TMR1L
ADD2_TIMER   macro
    CHK?RP  T1CON
    BCF     T1CON,TMR1ON           ; Turn off timer
    MOVLW   LOW(TimerConst)        ;1  1
    ADDWF   TMR1L,F                ;2  1    ; reload timer with correct value
    BTFSC   STATUS,C               ;3  1/2
    INCF    TMR1H,F                ;4  1
    MOVLW   HIGH(TimerConst)       ;5  1
    ADDWF   TMR1H,F                ;6  1
    endm

; -----------------  ADD TimerConst to TMR1H:TMR1L and restart TIMER1 ----------
RELOAD_TIMER  macro
    ADD2_TIMER
    BSF     T1CON,TMR1ON           ;7  1    ; Turn TIMER1 back on
    endm
7 is also the default number in mister-e's program, but different reload routines may take longer, or shorter times.

hth,