Legal analysis: The time limit for trademark objection defense is 30 days. According to relevant legal provisions, the Trademark Office shall promptly send a copy of the trademark opposition materials to the party being opposed, and the party being opposed shall respond within 30 days from the date of receipt of a copy of the trademark opposition materials.

Legal basis: "Trademark Law of the People's Republic of China" Article 27 The Trademark Office shall promptly send a copy of the trademark objection materials to the party being opposed, and the party shall not wait until the party receives a copy of the trademark objection materials. Respond within 30 days from the date of filing. If the respondent fails to respond, it will not affect the decision of the Trademark Office. If the party needs to supplement relevant evidence materials after filing an opposition application or defense, it shall declare it in the trademark opposition application or defense, and submit it within 3 months from the date of submission of the trademark opposition application or defense; if it is not submitted within the time limit, , it shall be deemed that the party concerned has given up supplementing relevant evidence materials. However, if the evidence is generated after the expiration of the time limit or the party fails to submit it before the expiration of the time limit due to other legitimate reasons, if the evidence is submitted after the expiration of the time limit, the Trademark Office may accept the evidence after giving it to the other party and cross-examining it.