Sentence:  In the relatively short <WSD>time</WSD> since these early observations , Venus has been observed at additional wave lengths in the range from 0.8 to 10.2 cm , and Jupiter has been observed over the wave-length range from 3.03 to 68 cm . 
Meaning of the word marked with <WSD> tags:  a period of time considered as a resource under your control and sufficient to accomplish something