Sentence:  Being somewhat delicate in health , at the age of sixteen he was sent to Southern Europe , for which he at once developed a passion , so that he spent nearly all of the following ten <WSD>years</WSD> abroad , at first in Italy , then in Greece , Egypt , Asia Minor , and Palestine . 
Meaning of the word marked with <WSD> tags:  a period of time containing 365 (or 366) days