I would say it is too huge for anyone else but those who actually wish to participate in the world championships. You can easily get to 2-3 minutes with just a "normal" system, no extra effort.
That said, the Pridmore system is EASY Mike

Easy in terms of you not having to come up with images, you create them with the material you have! The system is based on Konsonant - Vocal - Konsonant created in this fashion: The suits (16 combinations) give the first consonant. The first rank of the cardpair gives the vocal (13 different vocals) and the last rank gives the last consonant. club/club 4 A = KOT (a place you put shiz in).
Same conscept (but easier) for random digits and binary.
Random digits: 3 digits memoed in one image. First digit (10 combos) gives Consonant, second digit (10) gives vocal, last digit gives last consonant (1000 combinations)
Binary: 10 digits in one image. First 4 binary (16 variants) Con, middle 3 binary (8 variants) voc, last 3 binary (8 variants) last consonant (1024 combinations).
Sorry for typing like this, I am at work and my boss is lurking ^^
I think you guys could learn it without much difficulties. I use it for remembering binary