For real estate invested amount, if a sum of money was invested for 90% of the period, its weight is 0.9

What if we are considering an outflow, should not its weight be the time it was NOT invested. So if it was taken out on day 90 or 100, we subtract amount*0.1…???

Seems straight forward to me, however I am looking at Schweser mock, and they give you value and weight, and you are left wondering if the weights for the negative values are given as time invested or time not invested…