Solitude becomes valuable when it stops feeling like a waiting room.

Time alone spent waiting for it to end produces nothing. The hours pass as an interval between the parts of life that count, and they leave no trace. What changes their value is treating them as the thing itself rather than the gap between things.

Give your solitary time a purpose that belongs to it: reading, walking, making something, thinking about a real question. Not to be productive, but so it stops functioning as a corridor. Once the time has its own content, it becomes something you might look forward to rather than sit through.