grizzmoose, it depends on you. What are your goals for retirement, ie... golf, buying a henries tag every year, sitting on the porch, traveling etc..... plans for house (down size, up grade?????) all those types of questions. Everyone is different when they retire. The range is quite drastic on money requriements of their working income. It could be as little as 50% or be 100% or higher than working incomes.
Once you figure that out, that will help you determine your amount of money needed upon retirement. From that point a smart advisor would say the average gain long term is 7-7.5% per year. Then depending on the amount of time you have till your retirement age you will get a guesstimation on the amount of money needed to be invested each month to satisfy your retirement. remember nothing is guranteed though.
Just a helpful tip, only invest up to the % that your company matches on your 401k. Once you reach that start your own IRA/ROTH IRA, you have way more options for investments, and considerably more control over them. If your company does not match in your 401k, my recomendation would not to invest in them in MOST situations.
Mntman
"Hunting is where you prove yourself"