Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the average lap time for retired time of +23.707 and a Grid greater than 21?

### Inputs:
table_name: table, columns: ['Rider', 'Manufacturer', 'Laps', 'Time/Retired', 'Grid']

### Response:
SELECT AVG Laps FROM table WHERE Time/Retired = +23.707 AND Grid > 21