I’m currently testing from 2005 on the H1 for a few of my pairs (roughly 90k bars). I’ve been looking into using 20% OOS and then keeping the last 6 months of data in my back pocket as a final test after Monte Carlo. Today I just threw some GBPJPY strats on the demo account for testing, will let you know how it goes!
P.S. only 2 made it onto my demo account after 20 hours of scanning. Only the strategies that passed the 20% OOS and the 6 months visual check.