Mortar should be kept moist for 36 hours to allow it to fully cure. However, a heavy rain may wash the lime out of the mortar, weakening the bond between the bricks and the mortar. If the weather is warm, dry and windy, the mortar may dry too rapidly, pulling away from the bricks and crumbling.Click to see full answer. Subsequently, one may also ask, how long does it take mortar to dry?For example, thin-set mortar used for tiles and counter tops requires 24 to 48 hours to dry while brick mortar made from Portland cement can require up to 28 days to dry. When laying floor tiles, avoid walking on or grouting them until they are dry.Additionally, how can I make mortar dry faster? How to Make Thin Set Mortar Set Up Faster Use less water when you mix the mortar. Spread the mortar on a dry substrate. Heat the surrounding environment with a room heater, or direct the heat towards the mortar. Circulate the air around the mortar with a fan and keep the space ventilated to maximize air flow. Use quick-setting polymer-enhanced mortar. Likewise, how long should mortar set? 24 to 48 hours How long does it take for masonry to cure? Brick Mortar It will reach 60% of its strength within the first 24 hours and will take up to 28 days to reach its full cure strength.