You mean like industrial internship? I had it twice but it was not compulsory.
IF you mean like in university lab doing some research then yes, we have to write thesis that is at least 30 (usualy its about 50, sometimes longer) for bachelors or at least 50 for masters, including experimental work in a lab. Usualy ppl start at their 3rd semester when doing bachelors and right away for masters.
Hope it helps
ps: Im from Czech Republic, EU