Nope.
It is 38 days.
Lent begins March 1 (Wednesday) in 2017.
4 days that week.
6 days (6th - 11th)
6 days (13th - 18th)
6 days (20th - 25th)
6 days (27th - 1st)
6 days (3rd - 8th)
4 days (10th - 13th), until evening, with the beginning of Holy Thursday Mass in the evening. You can count the daytime part of Holy Thursday if you wish, and make it 38 days; or not count Holy Thursday daytime, and make it 37; I wonāt quibble. But it is not 40 days.
Holy Thursday is the 13th, and the start of the Triduum that evening, which is not part of Lent.
While the Triduum is by calendar three days - Holy Thursday evening to Easter Sunday evening, it is liturgically one day (c.f. the USCCB: "The summit of the Liturgical Year is the Easter Triduumāfrom the evening of Holy Thursday to the evening of Easter Sunday. Though chronologically three days, they are liturgically one day unfolding for us the unity of Christās Paschal Mystery.
The single celebration of the Triduum marks the end of the Lenten season, and leads to the Mass of the Resurrection of the Lord at the Easter Vigil.
The liturgical services that take place during the Triduum are:
Mass of the Lordās Supper
Good Friday of the Lordās Passion
Mass of the Resurrection of the Lord"
Easter is on the 16th.