There is no preference you can set just to get C-19 work or any specific type at Rosetta.
I assume the Boinc server scheduler will send out work with shorter deadlines first when it has them so if you keep running it you should get some.
You can reduce the target run time for each work unit in your account preferences, the default is 8 hours, the lowest is 1 hour. It is just a guideline so doesn't mean all work units stick to it. If you are turning work units over more quickly you will be taking more frequent bites of the queue of scheduled work.
Having said that the scientists do recommend that longer run times are more helpful.
What you set is up to you though, there is a preference for it.
I assume the Boinc server scheduler will send out work with shorter deadlines first when it has them so if you keep running it you should get some.
You can reduce the target run time for each work unit in your account preferences, the default is 8 hours, the lowest is 1 hour. It is just a guideline so doesn't mean all work units stick to it. If you are turning work units over more quickly you will be taking more frequent bites of the queue of scheduled work.
Having said that the scientists do recommend that longer run times are more helpful.
What you set is up to you though, there is a preference for it.