I can't speak to what % of income RPh's funnel into investments, but having seen enough financially-naive recent pharm grads get taken advantage of by a local 'financial advisor', I offer two bits of advice:
1. Take the time to learn how to invest on your own. You REALLY do NOT need a financial advisor. However, if you insist on using one, make sure that he/she is fee-based, and not commission-based! Sure, $150/hr may seem like a rip-off for someone's advice, but that's better than 'free' financial advice where you're getting pushed into less-than-optimal investment vehicles, just so your advisor can make a fat commission off of you.
2. Run away from anyone trying to sell you on variable annuities or any type of investment wrapped in life-insurance. They'll make them sound like great deals, but the couple of percentage points you give up yearly in fees will translate to being tens to hundreds of thousands of dollars behind when you retire. ...save the annuities for when you're old and gray and are looking for a constant source of income.