10.
Every year is longer than 52 weeks and so there is a week 53 in every year.
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There can be up to two "week 53" in a year when the first day of the year falls on a Thursday in a non-leap year. In the next 10 years, the occurrence of week 53 may vary depending on leap years and the day of the week the year starts on.
period of revolution in Earth years for Mercury is 0.241 and Earth is 1.00. So 2.41 years in Mercury equalls 10 years in Earth. Correction : Using the above figures (which seem about right) : 10 years on Earth equals 10/0.241 years for Mercury. That's about 41.49 Mercury years.
There are 100 years in a century, so 10 centuries would be 1000 years.
10,000 light years = 9.4605284 × 1016 kilometers.
There are 520 weeks in a decade. This can be calculated by multiplying 10 years in a decade by 52 weeks in a year.
The star 61 Cygni B is estimated to have a main sequence lifetime of approximately 10 billion years.