Having such a great count like that is a very amazing thing to think of. Ofcourse having a great count of bitcoin like that will push you to start being wise and knowing how you can let it stay for a long period of time. Saving will be a great thing or let us just say the best thing to do to be able to make your bitcoin last but saving will not just be a way to make your money grow because waiting or just holding it for a long period of time is like waiting for a tree to grow though worth a wait, we cannot still assure if the flow in the market is always on pump so to be able to add your gain, you must take a risk to spend it on useful thing such as investing into a beneficiary thing that you think can add up your current state of money.