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@gemlog
Well, it might be different depending on the objective. As this paper makes clear typical rotation lengths in the UK is 40-50 years (sorry PDF, see section 2.2.3):
https://www.napier.ac.uk/~/media/worktribe/output-229781/paper089pdf.pdf
Recent market prices have pushed the rotation length closer to 40

However, this paper recommends longer periods for considerations other than just RoI (another PDF):
https://www.forestresearch.gov.uk/documents/813/FCRP028.pdf

@wim_v12e