His only way to measure time had become to cast a tempus charm and compare the date and time to the date of his fateful meeting with Hermione. He had no care to watch the minutes or hours pass but for whether it was morning and night so that he may either drag himself from or to bed. Until, he ultimately began to refuse to leave his bed in the mornings. His house elf would bring him meals that were left untouched from where she had sat them down. His clothes would still be laid out each morning, finely pressed and laundered in anticipation of his rising to dress in the morning but those too would go untouched.