I am an assistant arbiter in an open tournament which is happening over the weekend, with 1 round on Friday, and 2 rounds on Saturday and Sunday.
There were 5.5 hours between the two rounds on Saturday and Sunday, but some players finished their game just before the scheduled start of round 2.
The head arbiter gave them a 30-minute break before they had to start their second round, which seems appropriate, but I cannot find any rules or requirements from FIDE regarding this.
Searching for this topic, I only found rules regarding tie-breaks, with requirements for breaks between a match and the tie-break playoffs, and break between games in the tie-break.
Is there anything in the FIDE Laws of Chess, or anywhere else, or is it completely up to the tournament organizers how much time between rounds the players can get?