There are different ways of pronouncing this word. Some people make it rhyme with the words “pleasure”, “treasure”, and “measure”. Others pronounce the “ei” in the first syllable like the “ee” in “fees”, “bees” and “knees”. No matter which way you pronounce the word the main stress is on the first syllable.
*In her leisure time, Vandana goes sailing.
If you refer to a man as a “gentleman of leisure” what you mean is that he is in a position where he doesn’t have to work. He has enough money to live on. A woman who is in a similar position is called “lady of leisure.”