Why is Maharashtra's Seagull Island visible for only 30 minutes a day?

Seagull Island, located near Devbag in Maharashtra's Sindhudurg district, is visible for only 30 minutes a day when the sea recedes during low tide. When the tide rises, the water level increases and covers the island again. The island remains completely submerged during high tide and disappears from view. However, the timing of its visibility varies from day to day.