I am student of an Asian Country who will apply to European Universities (mainly France, Germany, Finland, Netherlands, Denmark) for session 2022 for PhD in mathematics. So, I thought about writing to professors (email) asking about an open positions and if they are willing to work with me.
I have heard that in these countries there are holidays from December 22 to January first week.
So, should I write to professors(email) during this time and expect that they will reply to me or it is not a good idea to write to them during this time.