LOL. If you are going to skip the first-million, you might as well aim for trying to add another comma !!
It truly takes lot of saving, perseverance, and dedication to make the first million via traditional 401(K)/IRA savings method. It nearly takes 20-30 years maxing out year-after-year contribution, and hopefully with decent match by employer. This assumes employment without much breaks in-between, no surprise financial/health risks, employers matching contribution, disciplined to be invested in-the-market.
Many folks who claim 10-15 years for first-million do not necessarily mention that their investments outside of traditional 401K/IRAs -- such as self-employer 401K, or stupid-high employer matching-contributions/matches on very-high salaries, nor brokerage accounts. Or, RSUs/Stock-option positive exits. Additional savings/methods are as-important in-addition to 401K/IRA maxing-out to reduce the time to reach your first or next million !!
Ideally higher-salaries (ensued savings!), very-high matching from employers, or of-course self-employed 401(K), and/or contributing additional savings towards brokerage account being invested. If you are one of them successful entrepreneurs - kudos to you as well! If you have second income or spousal earnings - with good savings discipline - you got improved chances !!
The dilemma nowadays: the $1 million ain't get you as far, as it once used to. But - the time to reach that magic $1MM number - still takes considerably long dedicated years. Worse yet with these days many of traditional employer pension plans going-away (or bust), the need and urgency to get to $1 Million (or higher) is ever more important - and need to stay the course!