I'm not a fan of giving a website a simple number like an IQ rating because like people they can vary in all kinds of different ways. So I'd be interested in different organisations labelling websites in different ways.
The time to read is any time: no apparatus, no appointment of time and place, is necessary. It is the only art which can be practiced at any hour of the day or night, whenever the time and inclination comes, that is your time for reading; in joy or sorrow, health or illness.