We have the same issue. It's difficult to estimate tasks that you have never done before. You could break it down and try to align the small tasks with similar tasks you have done in the past to make estimation better.
I'm thinking of an adaptive strategy where real duration time can be updated as soon and it is available for each sub task. Given we break the tasks down to proportional task sizes we could re-estimate the whole task pipeline automatically in real time.
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We have the same issue. It's difficult to estimate tasks that you have never done before. You could break it down and try to align the small tasks with similar tasks you have done in the past to make estimation better.
I'm thinking of an adaptive strategy where real duration time can be updated as soon and it is available for each sub task. Given we break the tasks down to proportional task sizes we could re-estimate the whole task pipeline automatically in real time.