大方廣佛華嚴經隨疏演義鈔 68.42

68.42

疏「於無長短中隨問善釋」者，三世是長、一念是短，今明三世即一念是實，是空則無，長短不礙，能知種種時節長短劫事。

Regarding the Commentary's line, "In the absence of long and short, skillfully explaining according to questions asked": the three periods of time are long, and a single thought-moment is short. Here it clarifies that the three periods of time being identical to a single thought-moment is the real; being empty, they are non-existent, long and short not obstructing each other, so that one can know the events of long and short eons across various periods of time.