Roshar has 50 minutes/hour, 20 hours/day, 5 days/week, 10 weeks/month (50-day months), 10 months/year (500-day years). Brandon and Peter have said that a Rosharan year is 1.10 Earth years and that a Rosharan hour is shorter than an Earth hour. (This suggests we should assume the 1.10 number is precise.)

The definition of a year is somewhat ambiguous. The Rosharan year above clearly refers to a solar year, so we will assume that the 1.10 number compares solar years. An Earth solar year is 365.24219 SI days of exactly 24 SI hours. So for Earth we'll use 60 minutes/hour, 24 hours/day, 7 days/week, 30 days/month, and 365.24219 days/year.

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Using R to represent Roshar and E to represent Earth:

1 R minute = 1.16 E minutes = 69.4 E seconds

1 R hour = 0.964 E hours = 57.9 E minutes

1 R day = 0.804 E days = 19.3 E hours

1 R week = 0.574 E weeks = 4.02 E days

1 R month = 1.34 E months = 40.2 E days

1 R year = 1.10 E years = 13.4 E months = 402 E days

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A 10 year-old Rosharan is 11 in Earth years.

A 20 year-old Rosharan is 22 in Earth years.

A 80 year-old Rosharan is 88 in Earth years.