Estimation of creating index in SQL Server We create new index on our production database, with a few fields, our database size is around 300GB and it works for one hour and do not finished yet. 


How can you estimate this operation? 
If we will stop index creation; How time it will make rollback by your approximate estimation? 
How can we check creation status in management studio?
On SQL Server Std Ed, 2005-2014, there is no way to get est time remaining (and Sporri's answer on this thread is simply incorrect, sorry).

This thread has an actual answer to this question:
SQL Server: How to track progress of CREATE INDEX command?