Why it takes time
The service may be longer than services you have attended because it contains several movements of worship: preparation, incense, the offering of the Lamb, Scripture readings, the Creed, reconciliation, Eucharistic prayers, Communion, and thanksgiving. Each part has a purpose.
The length comes from the fullness of the Liturgy itself. It is a complete act of worship in which the Church prays, listens, offers, and receives.
The time also gives the faithful room to pass from ordinary distraction into prayer. The Church does not rush immediately to Communion; she prepares the heart through repentance, Scripture, confession of faith, intercession, and thanksgiving.
What fills the time
The Liturgy of the Word includes several readings: the Pauline Epistle, Catholic Epistle, Praxis, Synaxarium, Psalm, and Gospel. The Liturgy of the Believers includes the Anaphora, the institution narrative, litanies, commemoration of the saints, Fraction, Confession, Communion, and dismissal.
That structure is why the service has a deliberate pace. The Church is entering prayer, moving through Scripture, offering, thanksgiving, and Communion with attention.
Give attention to reading, to exhortation, to doctrine.
A better way to approach it
The best way to read the length is to follow one section at a time. Listen for the readings. Notice when the Creed is said. Watch when attention turns to the altar. The length begins to make sense as a rhythm of preparation, attention, and communion with God.
The service is long because the Church gives time to holy things: hearing, praying, offering, consecrating, receiving, and giving thanks.