How long does it take to prepare an EIC Accelerator application? A How long does it take to prepare an EIC Accelerator application? The time needed for an EIC Accelerator proposal preparation depends on the available materials such as business plans, documentation and financial information. In general, 1 month should be allocated for Step 1 and 2 months for Step 2. See: How long does it take to apply for the EIC Accelerator? (Grant proposal timeline)