Warren Buffett once said his favorite holding period is “forever,” and he was probably talking about Coca-Cola (NYSE:KO) when he said it. That kind of loyalty usually means a stock has earned it, and Coca-Cola’s second quarter gave shareholders fresh reasons to agree. Some of the boost came from clever timing, as World Cup hydration breaks doubled as ad slots that pushed Powerade volume up 8% and core Coca-Cola volume up 5%. Despite calling Coca-Cola a forever stock, Berkshire hasn’t bought a single additional share since 1994. For the bulls, sustaining guidance raises and volume growth is what keeps 27 times earnings looking reasonable.