[There's hesitation before the response is sent because guess what Dooku's single biggest weakness as a Force user is? It's the fact that he's a man in his 80s who is getting much too old for this.]
It is possible. Like most other forms of activity, using the Force can be exhausting after too long a time.
Re: [ Text ]
It is possible. Like most other forms of activity, using the Force can be exhausting after too long a time.