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_44332 ( "Rider" text, "Manufacturer" text, "Laps" real, "Time" text, "Grid" real )

### Question ###
what is the time when laps is less than 21, manufacturer is aprilia, grid is less than 17 and the rider is thomas luthi?

### Accurate SQL ###

SELECT "Time" FROM table_44332 WHERE "Laps" < '21' AND "Manufacturer" = 'aprilia' AND "Grid" < '17' AND "Rider" = 'thomas luthi'