Can it run for 24 hours? I am a newbie. The process is already running now. So I need answers for what can be done now as opposed what should have been done before shrinking.

we truncated tables and shrunk same size in another environment and it went through faster and completed.

in this database , its taking too long , can this be run for 24 hours and it will not cause any issue?

should we kill it now ? what is the command to kill it from the query window? I am running shrink database menu option in sql 2008 management studio?