User blog comment:Ratiu Grigore/Star wars vs.mass effect/@comment-69.144.238.157-20111110231501/@comment-217683-20111111064927

Where are the Death Star's lasers? Simple. ALL OVER THE STATION. The DSII has nearly 30,000 heavy weapons emplacements all over its structure. If the Reapers surround the station, GREAT! They'll get destroyed faster. As for recharge times, not sure where the 24 hour figure comes from. Per the Wookieepedia article on superlasers:

Originally, the Death Star's superlaser could only fire at planets and required hours to recharge the superlaser.[1] By the time the Death Star II was built, the superlaser was able to fire on large capital ships and required a much lower recharge time, a matter of minutes.