Most investors spend too much time thinking about when to buy and when to sell. Suppose the Singapore market closed tomorrow and stayed shut for the next 10 years. Warren Buffett once said investors should buy businesses they are happy to own for years, not days. OCBC (SGX: O39) – The Banking LeaderWhy I’d Hold It for 10 YearsEvery few years, banks are forced to play a different game. One moment they’re benefiting from higher interest rates, the next they’re dealing with slower loan demand or a weaker economy.