There are no rounds and no time limits, but the ref can pretty much end the fight at any point and declare a winner.
There are weight limits, but no weight cutting; fighters are just weighed the day of the fights. The tournaments are also open invitation, as long as you are above 18 years old you are free to participate. No need to even register in advance, just show up on fight day.
Here is video of a Muay Thai fighter competing against an MMA fighter in one of Arrows tournaments:
Once a fight goes to the ground, even if that ground is sand from a beach in Phuket, there is no way a Muay Thai fighter is going to stand a chance with a mixed martial artist who has even a basic understanding of jiu jitsu.
The next Arrows Street Fighting tournament will be held at an undisclosed location at a time TBD.
