Go trough the code I need to modify (or make the architecture if is a new one). Split it to subtasks if is big.
Estimate each substask( Including refactoring, tests, debug etc).
Multiply by 2 or 3.
If it is dependent on 3rd party (out of my reach) add a few days.
Mostly my managers asked about the time more to calculate how much can I do in a sprint, so is not really about the exact time, is about how much you can deliver in a sprint.
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Go trough the code I need to modify (or make the architecture if is a new one). Split it to subtasks if is big.
Estimate each substask( Including refactoring, tests, debug etc).
Multiply by 2 or 3.
If it is dependent on 3rd party (out of my reach) add a few days.
Mostly my managers asked about the time more to calculate how much can I do in a sprint, so is not really about the exact time, is about how much you can deliver in a sprint.