The answer
The raising of the incense occurs during the prayers of Matins and Vespers which precede the Divine Liturgies. During Holy Week, all services and the Divine Liturgies requiring the raising of the incense are not conducted from Monday until Thursday. This ritual correlates with the commemoration of the keeping of the lamb of the Passover for three days before its slaughter. Raising of the incense is used starting on Maundy Thursday beginning with the Liturgy of the Water (Washing of the Feet) followed by the Divine Liturgy of the Holy Eucharist.
Answered by His Eminence Metropolitan Youssef (opens in a new tab)