A good spell noun phrase informal
A beneficial or productive period of time
The company had a good spell before having financial problems.
A period of time that is fairly long
This project is quite challenging. I'm afraid that we will have a good spell of pressure ahead.
a long time ago
To remain influential in a particular situation or a particular group of people for a long time
Time is running out.
This expression means something will occur in the near future.
Blind man's holiday is the time between daylight and darkness when people cannot work because it is too dark to see.
Used when there are too many people involved in a task, and this can lead to a failure or its likely outcome isn't good
I think five people should be enough in our project. You know, too many cooks spoil the broth.