I will leave out a lot of things that -would- prove my point further to be 100% certain of the accuracy.
So if I remember correctly, the highest official power level in Dragon Ball is 150mil on Goku. Second highest being Frieza's 120mil.
17 and 18 were superior to ss1 on their introduction (ignoring whatever improvements were made since then)
Semi-perfect Cell was vastly superior to them.
etc etc
17<SemiCell<SuperVegeta<P-cell?=?MasteredSS1
For the sake of lowballing, let's just say that Perfect Cell equals Imperfect Cell + the two androids.
So Perfect Cell, and by extension MasteredSS1 is -at least- 3 times stronger than The initial ss1 goku.
So now we have a new ss1, vastly stronger than Frieza. ss2 is twice that and ss3 is eight times ss1, right? I could be wrong, but I've been hardcore downscaling so it doesn't matter at this point.
Meaning, ss3 is at least 24 times stronger than Frieza. (veeeeeeery lowballing)
ss3<Buuhan<ss1 Vegito.
This means that ss1 Vegito is -at least- 8 times stronger than base Goku. It also means that ss3 being 4 times stronger than ss1, a hypothetical ss3 vegito is -at least- 96 times more powerful than Frieza.
For this little part we're ignoring Beerus essentially having infinite power as the series went on more than just one movie.
"My Bulma" Vegeta is confirmed to be equal to or greater than ss3 goku.
Beerus used 10% against this same Vegeta.
Now Goku states a hypothetical ss3 vegito would not be enough... If we ignore how this does not make any kind of sense.. We can move on.. To ssG goku claiming to use 80% against what beerus claims to be 70%. I'll lowball it and say that ssG goku=50% Beerus.
So ssG is -at least- a 5x multiplier on top of ss3.
Meaning. SsG is -at least- 480 times stronger than Frieza.
We do not know exact measurements for SSB unfortunately... So I won't get into it. Let's pretend it doesn't boost power at all, so still 480 times stronger than Frieza.
ON TO THE MAIN POINT.
In 4 months(120 days), Frieza -AT LEAST!!!- increased his power 480 times. Every single day, his power increased 4 times.
(I cannot take random exponential growths into consideration, I do still feel like I'm excused for the lowballing)
So in one days training, he went from 120mil to 480 mil. So an increase of 360mil. 15mil every hour. ASSUMING HE DOESN'T SLEEP OR EAT OR... OTHER THINGS.
We know by absolute fact that fighting = training for growth.
So how long did Frieza fight on namek? Shall we say.... 2 hours? I'd say that is crazy lowballing, but let's go with it.
There is 1440 minutes in a day. 1 hour is 60 minutes.
So in those two hours, Frieza's power would be 150mil. Equal to Goku.
So to you patient ladies and gentleladies reading is this: How would you, from a story perspective(pretend you're the author if you want), answer these questions?
1. How did Frieza lose to Goku on Namek.
2. What if Frieza trained 5 months instead of 4? Would he oneshot Zeno?

And since I'm a big fanboy when considering Cell's potential(Frieza cells lol), please indulge me with these two as well!

3. What if Cell trained for 4 months and made a return either instead of Frieza.
4. What if Cell trained for 4 months and then immidiately joined the ToP instead of frieza?
Sorry for the wall xD
- Jogeta