In the above I'm unsure what 小时级发射 refers to. Some automatic translations are "Hourly launch" (Google Translate and Baidu) and "Hour-stage launch" (YouDao). It seems "hourly launch" could not be correct---the rocket doesn't launch every hour. My best guess is that it indicates that the rocket only takes hours to get its payload into orbit, but I'm unclear on this.
Question: What does 小时级发射 refer to in 该型火箭具有“一箭多星”发射能力、小时级发射等多项优点?
The whole passage means something like:
[My translation:] The Long March 11 rocket is a 4-stage solid carrier rocket, total length 20.8 meters, maximum diameter 2 meters, total mass around 58 tonnes, primary use is to launch payloads into near earth orbit and sun-synchronous orbit; this model rocket has "one rocket multiple satellite" launch capability, hour-grade launch etc. multi-faceted merits, and is acclaimed as the Long March rocket family's "quick arrow".