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_22252 ( "Canton" text, "Years of Kindergarten" real, "Years of Kindergarten provided" text, "Years of Kindergarten legally required" text, "Length of Primary School" real, "Length of mandatory Secondary School" real, "Separate Secondary Schools?" text, "Cooperative Secondary Schools?" text, "Integrated Secondary Schools?" text )

### Question ###
How many years is kindergarten legally requited in Zug?

### Accurate SQL ###

SELECT "Years of Kindergarten legally required" FROM table_22252 WHERE "Canton" = 'Zug'