Dlay Spray Topical Yes, Delay Sprays do work. Studies have shown that Delay Spray increases ejaculation latency (time to ejaculation) in men with premature ejaculation by up to 2-3 times the average time for healthy men. It is also effective for those who want prolonged sexual intercourse. You should note, however, that these effects are temporary and may only last one encounter or up to two hours if applied correctly.