It's very common that some tasks may take a long time to complete, and in that period they might be interrupted or paused by some circumstance, and resumed later.
Right now, there isn't a comfortable way to visualize this, because having the task split in two or more separate tasks might lead to redundancy in it's descriptions, checklists, etc.
Having an insanely long task all over a Gantt diagram isn't optimal either, specially when it was really worked on 50% of it's declared time.