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What’s it like the surgery of removal colostomy bag?

I am really confused now a days..who can help me?
My dad had a surgery one year ago.It was a colon surgery and part of colon was removed.But it’s not a permanent bag.So now his stool and gases pass to a colostomy bag.last week we met our doctor and asked him for the colostomy bag.At that time he told us, it’s time to remove his colostomy bag.So we gonna remove the bag.Specially I have to mention something here with this.when my father faced for the first operation,doctor did a mistake.so my father had to face for 2 surgery.at that time father was I.C.U for 3 weeks and my father’s situation was really bad.but fortunately he was recovered.
Now he is gonna remove the colostomy bag.So I wanna get more information about the surgery.How long does it take for this surgery and what’s it like? is it serious operation or not?? what kind of things should we care about this surgery? and so far information I need this time..please be kindly enough to answer me as soon as possible…and make sure don’t get this as a joke..