Об­ра­зуй­те от слова REAL од­но­ко­рен­ное слово так, чтобы оно грам­ма­ти­че­ски и лек­си­че­ски со­от­вет­ство­ва­ло со­дер­жа­нию тек­ста.

We also get the impression that it was a rather short period of time when people painted on cave walls, something like several hundred years. However, in __________________ it is not just hundreds but thousands of years!