Another FAQ entry here, with a very simple response…

Since we’re serving this foreign defendant under Hague rules, do they get extra time to answer?

Nope.  Nothing in the Hague Service Convention gives a defendant anything.  The deadline is the deadline is the deadline.  Why?  Because the Convention only goes to HOW process is served– it has literally zero effect on the management of the docket– other than perhaps stretching out the service procedure.

The answer deadline is determined entirely by forum court rules.

[Note that this post comes in under 100 words.  It doesn’t need any more.]