About 10 weeks from seed to harvest for autos. You can get a very nice harvest from a 1 1/2 month clone/veg or 2 month for seed/veg followed by an 8-10 week flower period, so anywhere from 3 1/2 to 4 1/2 months for a nice crop of indica- if you did a SOG (whole bunch of small plants) setup and flowered the plants 2 weeks after cloning you would get the crop in 2 1/2 months- the same amount of time for the ruderalis plants, just remember the individual plant won't get a huge yield by itself, but if you have 40 tiny plants the weight will add up. No matter what way you decide to go, you will get better yields with the "regular" compared to the ruderalis- you also get the added benefit of being able to clone the regular plant for the next crop. The ruderalis plants are great to grow, don't get me wrong, but they are more of a novelty than a commercially viable way to produce a crop.
I think you might want to check out a SOG grow- it does require a mother to take the clones from, but if you go that route you will essentailly double what you are growing in that 5 month period you mentioned.
Hope that helps.