Is there a time limit for overtime turns in Riftbound, and can stores implement their own time limits?

Ruling: Overtime in Riftbound is untimed (5 turns with point total determining winner/draw). Tournament officials are encouraged to watch matches and prevent slow play, but there are no timed turns.

Nuances:

• Stores can potentially implement their own timing rules for practical reasons (like store closing times), but this is not official
• Players should be clearly informed when non-standard timing rules are being used
• Adding time limits to turns creates complexity around what constitutes slow play versus legitimate thinking time
• Magic does not have timed turns in overtime, but judges at large events will watch matches and prompt players who take too long