CPU Cycle ~ 1 time unit
Anything you do at all. The cost of doing business.
CPU Cache Hit ~ 10 time units
Something that was located close to something else that was just accessed by either time or location.
Memory Access ~ 100 time units
Something that most likely has been accessed recently, but not immediately previously in the code.
Disk Access ~ 1,000,000 time units
It's been paged out to disk because it's accessed too infrequently or is too big to fit in memory.
Network Access ~ 100,000,000 time units
It's not even here. Damn. Go grab it from that long series of tubes. Roughly about the same amount of time it takes to blink your eye.
Local gigabit network ping time is 200 μs and an SSD typically reads a 4K block in 25 μs. I imagine that converts to 200,000 time units and 25,000 time units, respectively.
Both transmission delay and propagation delay are measured in units of time -- I don't understand how it's inconsistent. If you'd like to change the payload size, I've made it very easy to do so -- simply change the html at the bottom of the page and it will be reflected immediately up top.