Fact checked by Suzanne Kvilhaug It's important to be aware of the markets and how your 401(k) investments are performing.Credit: Getty Many Americans ask the question, "Will your 401(k) investment be enough to last you through your retirement?" To answer that question, you'll first need to estimate the length of your retirement, know all your retirement savings resources, and determine a smart drawdown plan. Here’s what you need to know. Key Takeaways The top factors determining the longevity of a 4 ...