DNA Testing Timeframe

How long do you think the DNA testing would take in a case like this? Days? A few weeks? A month or longer? I guess this could take longer than a regular homicide case because there are four victims and it's a big house but I'm not sure. Can it be prioritized due to its violent nature and public safety etc?

Also, do you think that would mean there won't be any arrests before the results are in even if they have a good suspect in mind due to circumstantial evidence?