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Ich hatte heute ein langes Telefonat mit meinem Chef.
I had a long phone call with my boss today.
A conversation conducted over the telephone.
Das Telefonat dauerte über eine Stunde.
The phone call lasted over an hour.
The term is commonly used in both formal and informal contexts.
Remember that 'Telefonat' is a neuter noun, so it takes the article 'das'.
Derived from 'Telefon' (telephone) + '-at' (suffix indicating an instance or action).
The term is gender-neutral and can refer to any phone call, whether personal or professional.