@ jorel
Unfortunately no FCOM Reference that I know of.
I recalled this figure from a handout for a Sim-Refresher.
We do 4 SIMs a year, 2 Checks and 2 REFs. Each REF has a special topic (here: ELEC) and and excellent handout (sometimes 100 pages and more) with a lot of 'nice to know' infos contained.
That's where my figure of 30 Minutes comes from.
Regards, MAX