Possible to check how much time an update statement on a table would take ?

Hello @all

I have a table with a fragmented Index, the table has an actula "user_updates" from 226'699.

How can i find out how much time an update on this table takes ?

i would like to check if there is any performance increase when i regroup the index (rebuild), cause the index has a fragementation of 85% now... (or should i delete the index completely) cause there are no user_seeks... only user_updates on the table... and i thought that indexes only makes sense if users are reading from the table... am i wrong ? (cause on every update from the table, the index (indexes) have to be updated too...

Thanks and Regards

Dominic