assembly languaoge 8086 code to cause some delay. after some operation before start of next block of code

This is a very useful procedure

delay proc near                ;requires delaytime
      push ax bx cx dx si di
      cmp delaytime,0
      je delay_exit_12

      mov si,0
      loopdel:
            mov cx,2000
            loop $
            inc si
            mov dx,delaytime
            cmp si,dx
            jle loopdel
      delay_exit_12:
      pop di si dx cx bx ax
      ret
endp
delaytime dw 0