The running of the period of limitations upon the assessment of the liability of a transferee or fiduciary shall, after the mailing to the transferee or fiduciary of the notice provided for in section
6212 (relating to income, estate, and gift taxes), be suspended for the period during which the Secretary is prohibited from making the assessment in respect of the liability of the transferee or fiduciary (and in any event, if a proceeding in respect of the liability is placed on the docket of the Tax Court, until the decision of the Tax Court becomes final), and for 60 days thereafter.