So to be a millionaire you need $1,000,000.
If you save $1500 a month to calculate the months that it will take you simply divide the million by the amount saved each month:
1,000,000 / 1500 = 666.67= 667 (rounded)
It will take 667 months
To calculate the years, since 1 year has 12 months, simply divide the 667 months by the number of months in a year (12)
667/12= 55.58 = 56 (rounded)
56 years.