Do I have to juice and drink the grass immediately?

Not necessarily. You could consider chilling your fresh squeezed juice to just above freezing temperature, say 34 ¬”+F. Then store it in a pre-chilled thermos. This can extend the viability of the juice for two or more days. Also, if you use a Green Star juicer – the gold standard of the juicing industry – its materials influence the longevity of the juice. You must consider the big picture. If drinking it immediately limits you to say…four drinks per week, and storing it properly raises you to eight drinks per week, then which do you think is better? Even if those eight drinks are only 90% as potent as fresh, eight drinks is more beneficial than four. Many folks have stopped juicing because they thought it was too much work. A small compromise that keeps you on the program longterm is the best strategy