England & Wales tenancy deposit: how quickly must it be protected?

For most private tenancies covered by the tenancy-deposit rules, the landlord or agent must protect the deposit in a government-backed tenancy deposit protection scheme within 30 days of receiving it and provide the required prescribed information within the same 30-day period. Official source: GOV.UK Deposit protection schemes and landlords. Guide: https://getinstantlaw.com/uk/england-wales/landlord-tenant