Sorry about that! I'll try to be more clear:

Patients see improvement in symptoms after 6 months, with some patients reporting improvement as soon as 6 weeks.

If patients stays on drops for 5 years, they can expect significant decrease in allergy symptoms for decades, even once they have stopped taking a daily allergy drop.

If the patient stops taking their allergy drops, they will still see a reduction of their allergy symptoms, but it won't last for decades -- it may only last a few months.