Yes, it can definitely be done.  
You can buy a [30-day PLEX](http://www.eve-central.com/home/quicklook.html?typeid=29668) for 300M ISK.  
You can make 300M ISK in a couple hours if you know what you're doing.  
The only difficulty is in that "know what you're doing" part.  
Instead of actively playing (which can easily take more than a couple hours a week) you need to utilize all the mehods of generating income while offline.  Research Agents, Planetary Infrastructure, and The Market are the three biggies.  
You'll need a while to set all that up, but the Steam "21-day free intro to EVE" (assuming that's still running) should be enough.  And you'll have to play a bit more than a couple hours a week to get it up and running, too.  
Warning: Some mission grinding to increase faction standing will likely be required.

On the whole though, I'd say that if your "addiction" only means a couple hours a week, then you haven't got any addiction to speak of.  8 )

This does bring up the valid question of how to use those three methods to generate 300M/month.

**How to make ISK while offline**  
<ol>
<li>Use the market to generate income  
<ol>
<li>Use the market to buy things you need and sell things you don't need.  This will teach you the basics of how it works: buy orders and sell orders.  Also explore the 'details' secion where you can see the volume traded per day and the low and high prices that day.  Notice the systems that the majority of buy and sell orders are based in, this is the 'regional market hub'.  
<li>Find items that have a high trade volume in your region and that you can post a low buy order for.  Post a buy order.  
<li>Collect your purchases, transport them to the market hub (or anywhere that you can get a good price for them) and post a sell order for them.  People will pay a good price if you're selling the item they want at the station they want.  
</ol>
<li>Develop Planetary Infrastructure
<ol>
<li>Use the market to find a planetary resource that sells well in your area.
<li>Find a planet that you can produce that item on, drop a Command Center on it, build extractors (and factories if necessary) to produce that item.
<li>Keep those extractors running on 5 or 23 hour cycles depending on how long it will be till you can set them again.  
<li>Post low buy orders for all the planetary resources you're producing on your planet as detailed in 1-2.  This is a good alternate source of resources if you can't set your extractors every 5 hours (and really, who can?)  
<li>Transport resources you've purchased cheaply to the planet, take away resources you've created on the planet.  Sell those resources as detailed in 1-3.  
</ol>
<li>Get Research Agents
<ol>
<li>Find corporations in your area that have R&D agents.  Get the best R&D agents you can.  Research the Datacore items they can produce for you, look on the market for which one is the most profitable in your area, start the research.  Drop a pile of Tritanium in the station where the agent is.  
<li>Run missions for those corporations to raise your standings with them.  Note: The missions that Research Agents give once a day count towards the 16 you need to get a storyline mission.  Try to get the storyline mission from an agent in the R&D corp.  
<li>Once the higher standings you've achieved give you access to higher quality R&D agents, stop the research with the old and inferior agent and start up a new research project with the new and improved agent.  
<li>Collect datacores every now and then, sell them as detailed in 1-3.
</ol>
</ol>
Note that market ability is the key skill here, all other methods are merely ways of cheaply generating things that you can then sell on the market for a nice profit.  Market ability only takes a couple hours to train on your character, but your personal skills at it will develop for years and years.