Thanks for reaching out to the forums with your question. I am sorry to hear you didn’t get the answer you needed through our live chat. I would recommend replying back to your ticket with that feedback as this is a pretty straight forward question that all our support team should be able to answer!
I want to assure you that you can use the Pause and Build plan at any time, for any length of time, once it becomes available to you. It will only be available after your store has been on a paid plan for 60 days, after that time you can utilize it as you need for your business. Even if you go back to the standard plans, you can switch back to the Pause and Build plan at any time. Switching plans does not reset that 60 day timer.
I hope this answers your question and if you have any other questions about plans for your business don’t hesitate to let us know.