Sound usually happens in time. It is the variation of density in a medium over time that is the physical sound that we hear. When translating acoustic sound into the digital domain the fundamental difference between analogue and digital becomes clear: sound is continuous, but digital is discrete. The original continuously varying signal of the sound wave gets measured at regular intervals, the sampling frequency, with finite precision. The precision is therefore limited in both time and amplitude. Converting a digital sound into an analogue signal, the opposite process is applied and a circuit does its best to fill in the waveform between the digital samples, usually oversampling the digital signal with linear interpolation between samples (Manning 2013, pp. 254-255).
When this conversion from digital to analogue audio happens the samples must be converted at the correct speed, the sampling frequency, but until then they are independent of time. Purely digital audio manipulation happens with whatever speed the CPU is currently running at and doesn't care about how many seconds or minutes pass. When time does matter, during playback, every sample is played with the exact same speed.
Therefore, while digital audio manipulation tools are able to change the perceived speed of a recorded sound to a great extent, the digital sound signal itself is neither slow nor quick.