. . . when people were asked to anticipate how much extra money and time they would have in the future, they realistically assumed that money would be tight, but they expected free time to magically materialize.
Hence you’re more likely to agree to a commitment next year, like giving a speech, that you would turn down if asked to find time for it in the next month. This produces what researchers call the “Yes ... Damn!” effect: when the speech comes due next year, you bitterly discover you’re still as busy as ever.