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_5 (laps INTEGER, time_retired VARCHAR, grid VARCHAR)

### Question ###
What is the total number of laps where time/retired is +2 laps and the grid number is bigger than 18?

### Accurate SQL ###

SELECT SUM(laps) FROM table_name_5 WHERE time_retired = "+2 laps" AND grid > 18