Federation Commander seems to strike a good balance between Star Fleet Battles and something light, but even it is a bit ponderous. My guess is that A Call To Arms is probably faster. At some point I'll dig out my rules and give it a try 
That's what the fellow who was showing off the game said (that
A Call to Arms plays faster/easier than
Federation Commander).
Even with him pausing periodically to explain various game rules/mechanics (plus both of us constantly digressing into discussing general Trek history/lore

), we were still able to fight a 2-on-2 match in under 3 hours, and a larger 5-on-5 slug-fest in about 6 hours. Had I been attempting to truly/fully understand the rules/mechanics at the time, it no doubt would've taken longer, but even then I doubt it would've taken all day. The combat mechanics seemed pretty intuitive, and I suspect most here could/would follow along even easier than I did.
Would be interested to read a review or AAR.
Seconded! (You know, during your copious amounts of spare time, of course.

)