The question seems to have some missing or unclear information. Specifically, it states:

• The electrician has 0 clients initially.
• The electrician can see [a certain number of] clients per day (the number is missing).
• You want to know how many days it will take to see 3 clients.

If the electrician currently has 0 clients, it means he has no clients to see yet. To see 3 clients, he first needs to get those clients. If you provide the number of clients the electrician can see per day, I can help calculate how many days it will take once he has those clients. Could you please clarify or provide the number of clients he can see per day?