How often should I review my account statements or online?

Generally, once a year is sufficient, and ideally on a regular schedule, not when you are worried about market volatility. The motive should be to obtain your current balance to plug back into the WealthStep advice engine, to see if any adjustments are necessary in your savings rate or portfolio selection, to get or stay on track. If the WealthStep advice engine does not suggest changes to your savings or investments, that confirmation will help you know you are doing the right thing, so that when the market gets bumpy, you are more likely to stick with your saving and investing strategy. People who make random or emotional savings or investment selections are more likely to panic in difficult markets. Also, studies show that the more often people look at their statements or online, the worse their results are (Thaler, et al, The Quarterly Journal of Economics, 1997), because frequent viewing increases concern and emotional investing.