Sure you can. You would use the action type 1082.
An example would be.
Code:
INSERT INTO cq_action VALUES
('1', '2', '3','1080', '2','isexit'),
('2', '3', '5','1082', '2','[color=blue]43200[/color]'),
('3', '4', '','101', '0','Please vote for us.'),
('4', '', '','102', '0','Yes 6'),
('5', '', '','126', '0','Sorry you have already voted in the last 12 hours');
This is only an example, but the blue will check for a quest ID of 2 and that 12 hours (In seconds) has passed since the quest was started.