How many leagues can I run?

Right, I'm no good at computers and stuff but just wondering if anybody could help me out. I currently only run one set of leagues when I play FM because I've never even thought of how many leagues my computer could run without becoming too slow.



These are my computer credentials- how many leagues/nations do you think I should be running?

Depends on how low you intend to go in each country. If you want a full 3/4/5 division structure I would suggest loading no more than three or four nations.
If you just want the top tiers then you can probably have six or seven with a medium or large detail level.

Cheers mate, will look to add a few more nations to my career story then.