Drag a time block, or start the timer.
Drag from 11:30 to 13:00 and choose the project to create a 90-minute entry. For work with no known end time, choose the project and start the timer from the dock. The running entry appears on today's calendar until you stop it.
Both methods create the same editable entry. You can move it, resize it, or update its project, phase, task, note, and scope afterwards.