285. How long does the presence of Christ last in the Eucharist?The presence of Christ continues in the Eucharist as long as the eucharistic species subsist.
Further reading: CCC 1377286. What kind of worship is due to the sacrament of the Eucharist?
The worship due to the sacrament of the Eucharist, whether during the celebration of the Mass or outside it, is the worship of latria, that is, the adoration given to God alone. The Church guards with the greatest care Hosts that have been consecrated. She brings them to the sick and to other persons who find it impossible to participate at Mass. She also presents them for the solemn adoration of the faithful and she bears them in processions. The Church encourages the faithful to make frequent visits to adore the Blessed Sacrament reserved in the tabernacle.
Further reading: CCC 1378-1381, 1418