Close the grill and cook for about 15â20 minutes, turning every 5 minutes or so. Check the corn ready when the husks start to get kernel-shaped char marks and pull away from the tip. If the kernels don't feel tender when poked with a fork, it's fine to leave the corn on until the husk chars black.
Orchids will lose their flowers after a certain time because they are spent and are producing new flowers on the stem. Also, some will lose flowers when they are too dry or have parasites.
Many orchids bloom once per year, some twice or even more. Once in bloom some flowers last weeks or months while others can last only days. Some basic research about the type of orchid will identify what to expect. For example, Phalaenopsis orchids usually bloom once per year and the blooms can last for months.