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_name_47 ( time VARCHAR, laps VARCHAR, manufacturer VARCHAR, grid VARCHAR )

### Question ###
How long did it take for the rider of a Yamaha with a grid less than 8 and laps less than 23?

### Accurate SQL ###

SELECT time FROM table_name_47 WHERE manufacturer = "yamaha" AND grid < 8 AND laps < 23