Hi Samir,
the distance between rounds may depend on the following elements:
- Urgency for the company to fill the position
- Timeline of the recruiting process
- Interviewers' agenda
- Candidate’s personal needs
Normally the overall range is between the same day (usually when you have another offer / would be difficult for you to come back to that office soon) to one month. If the second interview is too close to the first round and that’s not convenient for you, it’s usually possible to reschedule.
Best,
Francesco