About how long does it take to find all the pieces of one Terracotta Warrior?

It is hard to tell the time spent on finding them all, because in fact, the finding is still in proceeding nowadays. It is still unknown how many there are such terracotta figures in the site. Anyway, the unearthing starts in July, 1974, After that, there were several other unearthings, in 1976-1978, 1994, and 2009.