(a) The notice of hearing with respect to a claim or statement must be served in the manner specified in Sec. 25.8 within 6 years after the date on which such claim or statement is made.
(b) If the respondent fails to file a timely answer, service of a notice under Sec. 25.10(b) shall be deemed a notice of hearing for purposes of this section.
(c) The statute of limitations may be extended by agreement of the parties.