In the "task" area it is possible to record the time you needed for each single task belonging to a workspace, but it is not possible to do this in the "time" area. However, it would be really great and very convenient to have this option - e.g. for adding times the day after.
And an additional point: For further processing of time needed per task / workspace it would be perfect to have an export to csv as for the other reports offered now in 1.7.