Sentence:  And then again perhaps the reason why he could n't find <WSD>time</WSD> to do any of the things he had planned to do after retirement : reading , roaming , gardening , lying on his back and watching the clouds go by , was because he did n't want to do them . 
Meaning of the word marked with <WSD> tags:  a period of time considered as a resource under your control and sufficient to accomplish something