Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_1821 ( "Club" text, "First season in top division" text, "Number of seasons in top division" real, "First season of current spell in top division" text, "Number of seasons in Liga MX" real, "Top division titles" real )

### Question ###
How many 'number of season in Liga MX' were played if the 'first season of current spell in top division' is in 1962-63?

### Accurate SQL ###

SELECT "Number of seasons in Liga MX" FROM table_1821 WHERE "First season of current spell in top division" = '1962-63'