That depends on the production and conductor. Expect in the region of 2 hours. 1951 San Carlo took about 113 minutes and 1985 Verona took about 133 minutes
"Il Trittico" is actually 3 operas written 1918 [to be performed in one evening] by Puccini. They are -
'Il Tabarro' a lurid thriller
'Sour Angelica' a sentimental tragedy
'Gianni Schicchi' a...