Remember, you can check Paschale Solemnitatis on this site, among many on the internet.
Other than the procession, the Passion narrative is the most notable aspect of the last Sunday of Lent. It certainly takes up the most time:
33. The Passion narrative occupies a special place. It should be sung or read in the traditional way, that is, by three persons who take the part of Christ, the narrator and the people. The Passion is proclaimed by deacons or priests, or by lay readers; in the latter. case, the part of Christ should be reserved to the priest.
Note the “traditional” drama often presented in missalettes and hymnals is not so traditional if it includes the assembly shouting out.
The proclamation of the Passion should be without candles and incense, the greeting and the sign of the cross on the book are omitted; only the deacons ask for the blessing of the priest, as on other occasions before the Gospel. (Cf. Roman. Missal, Passion Sunday (Palm Sunday), 22. For a Mass at which a bishop presides, cf. Ceremonial of Bishops, 74)
Don’t scrimp, we are advised, on the length of the Passion, on the readings which precede it, or on the homily:
For the spiritual good of the faithful the Passion should be proclaimed in its entirety, and the readings which precede it should not be omitted.
34. After the Passion has been proclaimed, a homily is to be given.