Send me a reminder every 15 minutes to check on the project for the next 4 hours.
[IN:CREATE_REMINDER Send [SL:PERSON_REMINDED me ] a reminder [SL:RECURRING_DATE_TIME [IN:GET_RECURRING_DATE_TIME [SL:FREQUENCY every 15 minutes ] ] ] to [SL:TODO [IN:GET_TODO [SL:TODO check on the project ] [SL:DATE_TIME for the next 4 hours ] ] ] . ]