It depends on the current LIFESTYLE price, as the calculation is redone each day depending on the market price. It is 25% APR on SP delegated.

So you would earn 25 STEEM worth of LIFESTYLE each year, but the amount of LIFESTYLE may change on a day to day. So it would be 25 STEEM worth of LIFESTYLE if you sold the tokens each day at the current market price (hodling the tokens if you think the price could go up in the future would mean a higher than 25% APR)

We pay daily. Benefit of staking tokens is a bigger upvote on the platform. Just like hodling SP on Steem

hope that helps!