Epipremnum aureum
Pothos is forgiving, which makes it easy to get lazy with. It tells you when it is thirsty by drooping, then recovers within hours of a drink. The bigger risk is the opposite: soil that never dries between waterings.
Your answer
Water when the soil reaches this point
How it shifts through the year
Drooping is most often thirst, but overwatered roots that cannot take up water look the same. Feel the soil first. If it is dry, water. If it is wet, let it dry and check the roots.
A schedule gives a starting point, but light and season change how fast the soil dries. Use the interval to decide when to check, then water only when the top inch or two is dry.
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Related guides
Estimates use rules of thumb. Always confirm with your finger: push it about an inch into the soil before you water.