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https://2e.aonprd.com/Ancestries.aspx?ID=75 minotaur
https://2e.aonprd.com/Rules.aspx?ID=3270 Large PCs
https://2e.aonprd.com/Instincts.aspx?ID=4 Giant Instinct
https://2e.aonprd.com/Classes.aspx?ID=2 Barbarian
I would say the large creature wielding a huge weapon would have the reach of 15 feet then if it the weapon had reach then the reach would extend out an additional 5 feet and if a feat was taken to extend the reach out an additional 5 feet the total max reach would be
large weapon reach feat reach size increase of weapon
10 + 5 + 5 + 5 = 25 feet .