This site states this specific figure directly in its quick-facts table: 4 sprays daily.
Worth reading "4 sprays" as the specific daily total, distinct from the per-use instruction of taking it under the tongue or toward the back of the throat — the quantity and the technique are two separate pieces of guidance.
This site separately states each bottle is a 2 oz / 60 ml, 30-day supply — worth checking that four sprays daily across 30 days is consistent with that stated bottle size and supply length.
Backed by a 60-day money-back guarantee.
See The Current BreathiZen Offer