What is the form of the talbiyah, what is its meaning, when does its time begin, and when does it end?

Question : This questioner, Honorable Shaykh, says: What is the form of the talbiyah? What is its meaning? When does its time begin? And when does it end? May Allah reward you.

Answer : Praise be to Allah, Lord of the worlds, and may Allah send prayers and blessings upon our Prophet Muhammad, and upon his family and his Companions, and upon those who follow them with excellence until the Day of Judgment.
The form of the talbiyah is , and if one adds "Labbaik, God of Truth," or adds "Labbaik, and success is Yours, and the good is in Your hands, and the desire is toward You and the deed," then there is nothing wrong with that. The preserved form of the talbiyah of the Prophet (peace and blessings be upon him) in the Farewell Pilgrimage is the first one, namely . This is the well-known, preserved form in the hadith of Jabir ibn 'Abd Allah (may Allah be pleased with them both).
As for the meaning of the talbiyah, the meaning of "Labbaik" is "I respond to You after a response," because Allah the Exalted has made Hajj obligatory upon His servants and imposed it on them. So you say "Labbaik," meaning "I have responded to You, O Lord, to what You have made obligatory upon me." As for the word "Allahumma," its meaning is "O Allah." As for the phrase "Labbaik, la sharika laka," the meaning is complete sincerity to Allah (Mighty and Majestic), meaning that I do not associate anyone with You in this talbiyah. Rather, I respond to You sincerely, seeking no status by it, no worldly honor, no wealth, and not seeking for people to praise me for having performed Hajj or 'Umrah. Rather, I seek by it only sincerity for Your face, la sharika laka. Yes.
"Indeed, praise and blessing are Yours." This is an acknowledgment from Allah (Mighty and Majestic) that praise—which is describing with excellence, accompanied by love and magnification, meaning describing Allah the Exalted with the attribute of perfection, along with loving Him and magnifying Him for Him alone—and likewise blessing, which is the bestowal and giving, is for Him alone. "la sharika laka," meaning that no one shares with You in this praise that You deserve, nor in this blessing that You bestow. This is the meaning of the talbiyah. And with that, one says "Labbaik 'Umrah" if one is performing 'Umrah, or "Labbaik Hajj" if one is performing Hajj, or "Labbaik 'Umrah and Hajj" if one is performing Qiran. And when does it begin?
Some scholars said that it begins when one starts the ihram, meaning at the intention to enter into the rites, whether one has boarded one's vehicle or not. And some scholars said that it is better not to begin the talbiyah until one boards the vehicle. The matter in this is broad. If one begins the talbiyah when one finishes the prayer, if it is a prayer time, there is nothing wrong with it. And if one does not begin it until one boards the vehicle, there is nothing wrong with that.