How do you Define Maximum playing time in Age Grade Rugby (RFU v SRU)

Just as we are coming to the end of the first year of the new conference system for youth rugby in Scotland, where the ultimate goal is to see whole Club v Club and School v School competitions from U13 to U18s (and ultimately all played on a Saturday), so the RFU brings out their own revision to age grade rugby, under the banner of Regulation 15.
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