A peace lily does not need a watering timetable: check the compost instead
An indoor potted peace lily needs steady, light moisture, not constantly wet compost. At the start of autumn in Sweden, its needs change quickly as light levels fall, so a fixed calendar interval is often misleading.
Keep a peace lily lightly moist, but standing wet is worse for it than drying a little between waterings. Feel the compost with a finger: when the surface and the first couple of centimetres feel dry, water thoroughly so that the whole rootball is moistened, then empty excess water from the outer pot or saucer.
For an indoor potted peace lily, this often works out at around once a week, but in a darker position, or as autumn light fades in Sweden, it may just as easily be every ten days. In warmth above a radiator or in very bright light, it may need water more often.
If the leaves droop and the compost is dry, it has waited a little too long for water. If leaves turn yellow while the compost is frequently wet, you are probably watering too often. Aim to check the compost a couple of times a week rather than follow a fixed timetable.
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