On my main account I am 66 days in and have 8 six stars and half the sacrifices for a 9th. I would have everyhing ready for 9th already if I wouldnt have prepaed the first part of the Rhazin Fusion and done the arbiter quests which required me to fusion Justicar.
I six starred my starter early second week. I had done the first batch of arbiter missions in the first week.
after 66 days I progressed tol Doomtower floor 30, doing dragon 13 and spider 10, can do ice golem 13, close to arena silver 4, only weak arrea is clanboss. That with getting only 2 good epics and a somewaht useful legendary for arena out of 3 sacred shards and over 40 ancient shards at 2x events.
The fightying pit is ther for a erason. I never level anyone to 60. once they reach 58 they gget stuck into the pit and get fed some brew or overflowig commons.
Being in a decent clan helps a lot. clanwar give a ton of free ressources provided you hit all the milestones even if they are in the lowest tier. Also the clan should down the clanbosses from at least hard onwards daily.
Yes 6 starring is a lot of effort, you really need to think who is worth it and who can funtion at 5star also and who isnt worth levelling.
The videos I watched wer pretty clear, focus only in one champion at a time, don't spread yurself too thin.