All sage advise here. It took a few years for my 401 to get to 100k...a few less to 200...18 mos to 300...and probably another 7-8 mos to 400. There were setbacks...and I've moved money from stock to bonds...and I've missed some appreciation, but all in all it's been generally trending upwards for 20 yrs. Couple that w/ investments, pension, inheritance and a business...
I'm just happy I'll be there to support others.
Good luck young fellow