1 training hour (at any time within 12 months pre expiry) with FI or CRI, TMG and SEP exchangeable, only one needed.
The EASA requirement is for refresher training
of at least one hour total flight time so may be more than one flight with more than one instructor.
If the last instructor you fly with is FCL.945 certified, the instructor may sign the rating in the licence provided they have the same SOLI.