Thailand is preparing to halve the visa-free stay period for tourists from 93 countries amid growing concerns over foreigners engaging in illegal business operations and criminal activities, officials said. Thailand’s minister of foreign affairs, Sihasak Phuangketkaeow, said on Tuesday he would submit a proposal to the cabinet seeking approval to reduce the visa-free stay period for tourists from 60 days to 30 days. The proposal would also review the eligibility criteria for investment visas, long-term residency permits, student visas, and digital nomad schemes as part of a broader overhaul of Thailand’s liberal visa policies.…