Display a clock in analysis board

More important than the cost of 2TB of space is the cost of getting hosted storage (since I doubt lichess is hosted on someone's private hardware).

Compression can improve storage costs quite a bit here: you just store the clock readout and compressing something like

1:30
1:28
1:14
etc...

Is very powerful with Lempel-Ziv and the like (virtually every compression toolkit has this). I suspect the timestamps would take very little added storage. Plus, it appears they are already there since a graph is shown on replays. So it's just an interface change?!

This topic is a very good one. The present system is not next to useless in classical games : it is outright useless.
I can't believe it is impossible since some other chess sites already use it, and I much regret that I can't see any answer from the site's team.

I've seen this requested a number of times before, and I agree it would be a really helpful thing to have. Similar to NickelAnge, I've yet to come across input on this suggestion from any developers. If the storage issue is a concern that has been mentioned by devs before, then as others have mentioned I think it would still be worthwhile to use the move times that are already stored to display approximate clock times. Even if they are not exact, the basic information would still be there.

This sounds like a great feature. As mentioned, it would be really helpful when looking back at the game.

Before I created a Lichess account, I used to play on http://play.chessbase.com/. I played as a guest, and after each move it showed me how long it took for me to make each move, along with my opponent. I agree, this would be cool to see on Lichess.