Is it ok to freeze cells again after less than one week of thawing them? and if not, what is the minimum time that should pass between thawing and refreezing again?
It is unfortunately (often) true that more damage is done during the thaw, than in the freezing process. Refreezing is usually not recommended. However, If you have a recommended method for freeze and thaw, trying a refreeze may be worth a try. At least you will then know for yourself.