I’m with Erudite Sam on this one. What Rashi means is that it is an unreasonable expectation of Kohanim, as opposed to Malachim, to BEGIN removing their Bigdei Kehunah the very moment that the Avodah finishes. The “Hasha’ah” of Rashi refers to time after the Avodah has finished when the Bigdei are resting upon the Kohanim – as opposed to time when the Kohen is in the process of removing them.
