Not quite sure on the question. I think it depends when they respond, and what their answer is.
The process under ECS is that the Subcontractor submits a quote within one week, and the Contractor responds within four weeks. If they don't respond within that time, the Subcontractor may notify of their lack of response. If they don't respond to that reminder within three weeks, then the quotation is deemed accepted. If they respond within that three weeks why they don't agree with the quote and request a revised one, then yes the process/clock restarts in terms of the Subcontractor submitting a revised quote within one week and the Contractor having a further four weeks to respond.
You would like to think both Parties would recognise the importance of getting through this process as quick as possible so both know their liability.