Mining Turtle 5x5 Tunnel

function digIt()
  while turtle.detect() do
    turtle.dig()
    os.sleep(0.5)
  end
  turtle.forward()
  while turtle.detectDown() or turtle.detectUp() do
    turtle.digUp()
    turtle.digDown()
  end
end

local j=0
local k=0
local run=0
term.write("How Far?")
run=read()

for i=1,run do
  digIt()
  turtle.turnLeft ()
  digIt()
  turtle.forward()
  digIt()
  turtle.turnRight()
  turtle.turnRight()
  turtle.forward()
  turtle.forward()
  digIt()
  turtle.forward()
  digIt()
  turtle.up()
  turtle.digUp()
  turtle.turnRight()
  turtle.turnRight()
  turtle.up()
  turtle.digUp()
  digIt()
  turtle.forward()
  digIt()
  turtle.forward()
  digIt()
  turtle.forward()
  digIt()
  turtle.turnLeft()
  turtle.turnLeft()
  turtle.forward()
  turtle.forward()
  turtle.turnLeft()
  turtle.down()
  turtle.down()
end