Found this which seems to work:

[font="Times New Roman"]SELECT GETDATE() --your query to run

raiserror('',0,1) with nowait --to flush the buffer

waitfor delay '00:00:10' --pause for 10 seconds

GO 5 --loop 5 times[/font]

With the only issues being-

1) It appends to the results window - would rather it overwrote

2) No end-time, though suspect that could easily be done, or I could use simple arithmetic to run for a fixed period.