A 72 year old man with hypertension and chronic kidney disease presents with progressive exertional chest pain. Coronary angiography demonstrates 80 percent stenosis of the proximal left anterior descending artery and 70 percent stenosis of the mid right coronary artery. Left ventricular function is normal. He undergoes percutaneous coronary intervention with drug eluting stents in both vessels. According to current guidelines, what is the recommended duration of dual antiplatelet therapy with aspirin and a P2Y12 inhibitor if he has stable ischaemic heart disease and no high bleeding risk?