I spent many years in grad school trying to poke bees and do vaccines with needles.  Like, years, years at the bench, "Oh my gosh, it's 3 a.m.
大学院ではハチにワクチンを注射するために長い時間を  そう何年も何年も 研究室に居残って 「おやもう 朝の３時になってしまった」