Does anyone know how soon after an S-1 filing a company can issue their IPO? Is it basically up to them once they've filed or is there some vetting period at th

Does anyone know how soon after an S-1 filing a company can issue their IPO? Is it basically up to them once they've filed or is there some vetting period at the SEC? Will they be doing a road show next or is this something that they would have already done prior to the filing?