Jesus died Friday and rose Sunday:
[Luke 24:1, 13, 18-25 NASB]
1 But on the first day of the week, at early dawn, they came to the tomb bringing the spices which they had prepared. ...
13 And behold, two of them were going that very day to a village named Emmaus, which was about seven miles from Jerusalem. ...
18 One [of them,] named Cleopas, answered and said to Him, "Are You the only one visiting Jerusalem and unaware of the things which have happened here in these days?" 19 And He said to them, "What things?" And they said to Him, "The things about Jesus the Nazarene, who was a prophet mighty in deed and word in the sight of God and all the people, 20 and how the chief priests and our rulers delivered Him to the sentence of death, and crucified Him. 21 "But we were hoping that it was He who was going to redeem Israel. Indeed, besides all this, it is the third day since these things happened. 22 "But also some women among us amazed us. When they were at the tomb early in the morning, 23 and did not find His body, they came, saying that they had also seen a vision of angels who said that He was alive. 24 "Some of those who were with us went to the tomb and found it just exactly as the women also had said; but Him they did not see." 25 And He said to them, "O foolish men and slow of heart to believe in all that the prophets have spoken!
Friday: Jesus was tried, crucified and buried before sunset (the start of Sabbath)
Saturday: Sabbath, the women unable to finish anointing the corpse.
Sunday: First day of the week. The third day since Jesus was arrested, tried and crucified. Women return to the tomb with spices and find it empty. Apostles visit tomb and find it empty. Jesus appears to disciples on road to Emmaus.
See the story of Queen Esther calling for prayer for another example of three days including part of a day rather than a full 72 hours.