It all depends on your geographical location I guess :) You probably could leave them outside (or on window sill) for most of the day in Russia or Poland and they would be fine. The day is shorted and sun is not as harsh.
If I leave them here on a full sun they get sunburn. Most of them will. Some will change the colour, some will die.
Where they come from they hardly ever get full sun all day long. Unless its those huge, tall dessert ones.
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I understand you.
But I thought the cacti were from Mexico. And there's a hot sun.
And now I thought-maybe I really saw the burns on the cacti? such spots are dry.
Some cacti are from Mexico. I think majority of mine are from somewhere in South America where they almost always have other plants growing near. Some of them will grow on side of mountains where the sun is shining for few hours. They also will be protected by rocks sticking out here and there.
Generally they are used to high temperatures (except the ones that grow higher in the mountains), colder nights, but not necessarily direct sunlight all day long.
Some have thick spines that will protect them from the burs and are more resilient than others.
Have a look:
Echinopsis is one of the most common cacti.
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And Mammillaria bombycina that I have on the photos above growing on rocks in Mexico :)
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Yep :) Looks like light brown crust.
Don't you make tequila? ;)
Haha nope :D