According to the Letter of Intent, Chiyoda was required to complete the work within 24 months of the date of the Letter of Intent, or within 22 months of the effective date (presumably of the formal contract to be entered into by the parties).
根据意向书， Chiyoda必须在意向书之日起24个月内完成工程，或在生效日(假定是有关方正式签订合同)之日起22个月内完成。