Execute Timings
This extension displays when the last execution of a cell occurred and how long it took.
Every executed cell is extended with a new area, attached at the bottom of the input area, that displays when the user started the last execution of this cell. When the kernel finishes to execute a cell, this area is update with the duration.
The timings area can be hide by double clicking on it or using the option in the cell menu. The menu toggle timings->All hides (resp. shows) all the possible timings area if the first cell is displayed (resp. hidden).
To be sure that the kernel is run intentionally by executing a codecell, codecell.prototype.execute() is overloaded and a new event 'ExecuteCell.ExecuteTime' is fired, that this extension catches to display the start time. We use the event 'status_idle.Kernel' to know when the kernel finished the execution of the cell.
Follow the installation instructions appropriate to your IPython version as explained on the main wiki home pages:
The timings information could be stored into the notebook and displayed when it is loaded. Where these information should be stored is still to be decided (maybe in the metadata).