This happened to me about a decade ago, and because I didn't have huge savings, I put it into a diversified range of shares (at that stage I hadn't heard of index funds - that would have been an easier way).
Now, I'm 5 years out from retiring, and I have very little interest in moving that date sooner. So now, with any bonuses we get, 20% goes into investment (which really just increases our safety margin/gives us more comfort in retirement), and 80% just gets left to splurge on whatever (usually some combination of furniture and/or travel).
So in my mind, it really depends on where you are up to financially.