This is the first time in over 30 years that our team has made it to the champion finals.
▪If I omit the preposition "in", will there be any change in meaning of that sentence? Because, I think "over" in this sentence neans "during", so there is no need to use extra "in" before "over".
▪If I omit "over" then does it mean during? Like: this is the first time during 30 years?