A 65-year-old patient is admitted with an acute ST-elevation myocardial infarction (STEMI) and undergoes primary percutaneous coronary intervention (PPCI) with stent insertion. According to NICE NG185, what is the standard duration of dual antiplatelet therapy (DAPT) with aspirin and a P2Y12 inhibitor (e.g., ticagrelor or prasugrel or clopidogrel) following STEMI treated with PPCI, in the absence of contraindications or high bleeding risk?