Sorry for the late reply, but what are you talking about? Wasn't it already explained that the materialization time was drastically lengthening over time as the S rank core was gradually absorbed? Iirc, back when she was still intoxicated and recovering, the materialization time had extended from 30 seconds to 15 minutes already. More than a day seems to have passed since then, so it's probably at more than 30 minutes at this point.