Science & Industry

It's not so much a matter of training time, for them to be self sufficient. It's a matter of you having the investment capital, for the jobs they perform to be profitable to the point where they pay for their sub time. It's worth plexing dual character training, if you have a specific set of skills you want them to have, and have no use for them beyond that, because then you can just do it on your main account, and not perpetually be paying for additional accounts.

In terms of the isk you are making, that all depends on what you are investing to do, but generally diversifying is a very good idea. Especially if you are paying for another account for them, you want to do as much as you can with them, whether it is researching up bpos to sell, making copies to invent with and inventing, constantly producing components or ships to sell, and so on. The income is not tied to the character, but the activities the character facilitates you to do.

You can do any t1 industry with just Material Efficiency V. There are areas where t1 can be profitable. This would take you less than a month to train. Investment would be generally low unless you looked into some of the bigger ship hulls. Things to look into is ammo, rigs, fuel blocks, items that people use the t1 version of.

T2 manufacturing is consistently profitable, ranging from 250k-500k isk/hour/slot. 500k+ items usually are experiencing a peak and will not stay that way for long. (Of course if you can predict these peaks, then you will become very rich.) T2 takes a lot of skills though and requires you to do invention. Getting copies for invention usually means you need a pos or access to a low/null sec station with copy slots open.

Skills for t2 will probably range about 3 months to cover all 4 races with lvl 3 skills + standard other industry skills. If you keep it to a single race, you might be able to make some stuff within a month or two. Higher science skills are mostly for invention.

As a young producer you can make 20% return on capital per month without too much fuss. Grinding standings for better taxes and the skills you need might take a couple months. As you transition from preferring markup to preferring better factory utilisation, you'll see your rate of return transition toward 5% monthly return over time.

In a low capital scenario, fuel blocks and medium rigs are your best entry point items. As you build your capital, a portfolio that begins to include cruisers and larger, and larger rigs, begins to make more sense.