It only takes a chameleon a few milliseconds to change color. Despite popular belief, chameleons don't necessarily change color to match their background. In fact, chameleons change color to maintain a favorable body temperature since their bodies can't generate it's own body heat.
chameleons can change color in a matter of milliseconds
about 5 seconds becuase its got to make sure he gets it in the right place
not very long
Pretty long
The names of colors were named by different languages from a long time ago. When a language saw a named from something, they would take that name and change it to fit their language. Ex: English: Blue, German: Blau
You should take him to a reptile vet, your poor chameleon could be having a prolapse or have a hemorrhoid. It can be extremely painful so take him in as soon as your read this.
it takes about like 30 seconds!
Chameleons change color to communicate, regulate body temperature, and camouflage themselves. They can change color in a matter of seconds or minutes, depending on their mood and environment. So, to answer your question, chameleons change color as often as they damn well please.
it may take millions of years.
Different colors take in heat at different amounts also for camouflage
You take food coloring and add it to the plants water it will change the color
it wont take long