Can the defense time in the patent reexamination procedure be extended?

After the request for patent reexamination is examined by collegiate bench, there are two kinds of notices issued by the Patent Reexamination Board: one is the notice of reexamination (ordinary) and the other is the notice of oral hearing of the request for reexamination (rare), and the time limit for reply is specified (1 month). Before the expiration of the prescribed time limit for reply (including the expiration of the deadline), a request for extension of the time limit may be made. If the extension period is less than 1 month, it shall be calculated as 1 month, and the longest extension period shall not exceed 2 months; Generally, the time limit stipulated in the same notice can only be extended 1 time, with a maximum extension of 2 times; 300 yuan will be postponed 1 time every month, and 2000 yuan will be postponed again every month. In other words, for the specified time limit in patent reexamination, the longest extension time can reach 4 months, and the highest cost is 4600 yuan.