Different Calendar

Anand's calendar is showing the number of days differently for each month.

 January 73
February 83
March 51
April 52
May 31
June 42
July 41
August 63
September ?

 Answer:

 93

 How to arrive at the solution:

 Let's consider the numbers present after the month in the form ab where,
a denotes the number of letters in each month and
b denotes the number of vowels present in each month.

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