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Sof Zman Biur Chametz- Until what time may one own and benefit from Chametz:

Benefiting from Chametz: It remains permitted to receive benefit from Chametz until the beginning of the 6^th hour on Erev Pesach. Thus one may sell Chametz to a gentile during the 5^th hour. As well one may feed it to animals and birds during the 5^th hour. From the 6^th hour and onwards, all Chametz becomes forbidden in benefit even if it does not belong to him. Thus, one may no longer sell Chametz to a gentile, and may not feed it to animals and birds. See Chapter 2 Halacha 4B for the full details of this matter!

Owning Chametz-Remove all Chametz from home: It is forbidden to own Chametz starting from the 6^th hour on Erev Pesach.^[1] Thus, prior to the start of the 6^th hour, one must clean the house of all Chametz leftovers and either discard it in a public for all area or destroy it.^[2] Likewise, one is to place all the Chametz that one is planning to include in the sale to the gentile, in the designated area.^[3] Once the 6^th hour begins, it no longer helps to disown and discard the Chametz, and if one did not perform Mechiras Chametz, all the Chametz left in one’s home must be destroyed.^[4] If one did perform Mechiras Chametz, then all leftover Chametz past the 6^th hour is to be swept into the area sold to the gentile.^[5] See Chapter 2 Halacha 5-9 for the full details of this matter!

Throwing out Chametz garbage: As stated above, all Chametz garbage must be thrown into a public for all area prior to the 6^th hour on Erev Pesach. Accordingly, the Chametz garbage on Erev Pesach is not to be discarded into a  building garbage shoot or privately-owned garbage canister. See Chapter 2 Halacha 8 in Q&A for the full details of this matter!

Cleaning pockets: Prior to the 6^th hour, one is to check the pockets of his clothing for Chametz. See Chapter 3 Halacha 7 for the full details of this matter!

Biur Chametz:

During the 5^th hour, prior to the start of the 6^th hour, one is to perform Biur Chametz in order to fulfill the Biblical command of Tashbisu. One is to burn at least a Kezayis of Chametz. One is to burn any Chametz that he found during the Bedika, including the ten pieces of bread and the vessels used for the Bedika, such as the spoon and candle. If one did not find any Chametz during his search, then it is proper for him to burn the vessels used for Bedika. Some have the custom to use the Aravos which were hit on Hoshana Rabbah as fuel for burning the Chametz. See Chapter 4 Halacha 17 for the full details of this matter!

Bittul: Prior to the start of the 6^th hour, after performing Biur Chametz and burning at least one Kezayis of Chametz, it is proper to repeat the bittul, and nullify once again all the Chametz which he has in his possession. The Bittul cannot be performed once the 6^th hour has arrived. See Chapter 4 Halacha 16 for the full details of this matter!

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[1] See Chapter 2 Halacha 5G for the full details of this matter!

[2] See Chapter 2 Halacha 8 for the full details of this matter!

[3] See Chapter 5 Halacha 5 for the full details of this matter!

[4] See Chapter 2 Halacha 6 and 8-9 for the full details of this matter!

[5] See Chapter 2 Halacha 9A for the full details of this matter!