How long does it take to build a tunnel kiln with an annual output of100000 bricks?

Look at the size of your construction team. A brick factory near our village, a tunnel kiln with a cost of about180,000 yuan a year, took more than a year, but the construction team with only a dozen people, the most important thing is that it takes a long time for the tunnel kiln+chimney main body, as well as earthwork, which was manual at that time. Now that there is machinery, it should greatly shorten the time. If there is an excavator, it can be completed within half a year.