It is a succulent plant and holds a lot of water in its leaves. Its leaves will become soggy if we over water it and droopy if we provide less water. Watering once in 14-15 days is fine but, it depends on factors like Potting material and Season.
The terracotta pot is better in the case of overwatering because of its porous nature. Normal plastic nursery pot takes a lot of time to dry. Water the plant until water drips from the drain holes. Do not water the plant again until the soil dries out completely.
We should allow the soil to dry between watering and try not to rot the roots. Snake plants can sustain even if we water it once a month. In winter, watering once a month is fine. So, water less frequently in winter and more in summer.
If edges of Snake plants are becoming brown, it indicates that water is too little or more.
A moisture meter is a handy tool to check the soil moisture.
Click here for more information on a moisture meter.