I generally answer email in a day's time. When expecting a reply, please check the Spam and Junk Email folders!
I am very serious about stress management. This includes both your stress and mine. Therefore, I ask you to be understanding in the case I do not answer the phone. I suggest the use of email to schedule a video call instead.
My time zone is CET (UTC+1) during the winter, and CEST (UTC+2) in the summer.