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Hello L., and all,
For that you can use `Print between` command as:
@startgantt Project starts 2020/05/14 Print between 2020/05/17 and 2020/05/20 [Task1] on {Alice} lasts 20 days [Task2] on {Bob:50%} lasts 2 days then [Task3] on {Alice:25%} lasts 1 days [Task 155] happens at the 20th of May 2020 @endgantt
Ref.:
Enjoy,Regards,Th.