I drink mine without (perish the thought!) sugar, milk or cream [shudder].
The flavour of the coffee is what counts.
Usually, 3 to 4 sips after first inhaling the aroma. The last sip is preceded by a swirling of the coffee to wash the crema from the sides of the cup.
However, if I really want to treat myself to pure luxury, then I precede the sipping by popping half a square of Lindt 99% Cocoa solids Excellence 'Noirissime' dark chocolate on my tongue and sipping the hot espresso over it. Then I can enjoy the rich, dark flavours of very strong chocolate and coffee.
Discuss flavors, brew temperatures, blending, and cupping notes.
Too long a linger and aroma and taste drop off. Usually, for me 2 or 3 sips and a gulp. Time, about 1 1/2 - 2 minutes. However, a capp hangs in better and I can enjoy a more leisurely pace. What a wonderful problem to face!