Just did my SEP LPC today...
And had an interesting chat with the examiner afterwards. She told me originally the LPC was just a test of general handling and as such could be done reeeeeally quickly. She also told me that a brief nav exercise was included to ensure dead reckoning skills were present, as in the GPS era it had been found that these skills had been seen to fade somewhat in those taking their revalidation/ renewal.
Here's what I did:
Planned and flew a route (20 nm/ 15 minutes duration)
en-route diversion (25 nm/ 20 mins-ish)
Steep turns
Clean stall/ incipient stall recovery in landing and low speed configuration
EFATO/ PFL.
Flapless approach/glide approach/ bad weather circuit.
total time 1.6 hours.
I didn't feel like the sharpest tool in the box while I was doing all that (haven't flown in the last year until this week and my baby Son decided to get colic all last night) but even so I doubt I'd have done it in 20 minutes at the height of my powers!