Yes, if sufficiently diluted and spaced, ACV can be consumed up to three times in a day. However, caution must be exercised as consuming too much can be counter-productive for your body. Consuming too much can disturb the pH of your digestive tract and can worsen symptoms of heartburn and acid reflux.
When taken in the correct quantity, it can help prevent these very same ailments. Furthermore, the ideal dosage and timings depend on your personal medical history and the characteristics of your body, like acid production levels.
It is therefore recommended that you consult your healthcare provider before deciding on dosage and timing of consumption.