Why do you feel they have become weak? Is the fixture loose? Are you not able to chew the food like u used to? Are the ceramic fixtures chipped? If either of the teeth supporting the fixtures is loose, we can't take the support of the same teeth again for making a new fixture. Then time for new fixtures depends on the line of treatment. If it's a matter of just taking out the old fixtures and replacing it with a new one, it will take 2-3 days.

Hi sir it will take 3 to 4 days to fix ur teeth.

It takes 3-5 days. You will have to go for taking impression for new ceramic fix prosthesis. N then come for trail and final cementation.

First need to take x Ray to see y the crown has become loose if the roots are firm den will take maximum 4 to 6 days to give new crowns