really don't know.
I suppose it depends from luck, which lv and server you are.
Another approach of winning the treble is to have a very strong team and some extra sources.
For example I have a reserve team at lv one. Staying there on purpose, playing only for the Cup and associations.
(I 'm just waiting at some time to activate it again but not soon).
This team has a basic 12th squad of 130%.
In the league I could be the top dog, the same in the Cup where I 'm facing teams from lv2 but not stronger than mine.
In CH.L. there is a possibility to face a strong active team and get disqualified.
Also as happened to Palash Mitra , to face a strong tanking team or an (asso) tanking team in the Cup.
But if you are facing many good active teams, it's very possible to have a bad day/a bad role dice or just loose concentration which is the most important.
(for example when I 'm playing in an easy league, doesn't matter if I didn't had the time to switch my 11th squad and play with the same 11 tired players. But in a competitive league, it's something you could pay for).
Anyway, it's a matter of philosophy - lol
I believe a logic target for every good, active manager is to win for once the treble.
Then, maybe two more trebles so to get the achievement (LV1 is one treble, LV2 is 3 trebles, LV3 is 10 trebles).
After that you can play as you want as 10 trebles is for hardcore players.
Like me hahaha
I started at levels 2-3-4 with doubles , loosing in quarter or semi-finals of the cup for teams 2 levels above.
Then Beckstar started this thread so I won my 1st treble at lv5.
Then, I kept running, like Forest Gumb.
he started running and arrived at West (Pacific) coast and then he turned around and started running till the East (Atlantic) coast.
And then one day he stopped - lol.
So I won 10 trebles, now two more as I 'm going for another 10.