Without a mortgage system, at most a few years of saving to fully buy a house.
I understand what you are saying when you think it is a similar thing, just the scale of numbers is different. Debt is a responsibility, and a really serious one. At all costs avoid it because there is no guarantee you will have the capabilities to pay it back + interest . If we can champion a system whereby buying assets does not involve an individual taking on a life destroying risk and instead they can use their normal income to save up in a reasonable amount of time, then this would be the best way.
Yes there will always be people and entities that are richer than the rest. The aim is not to squash every class into the same income bracket, rather stop the propogation of abuse that rich companies inflict by extracting wealth from the poor.
Stoping usurious interest loans means the economic interaction of rich with the poor. If they want to make money from their hoard, then they have to engage with the lower class on a level playing field (in terms of risk) with investing. In stark contrast to sitting on a throne and receiving guaranteed wealth from poor people who have no choice but to take on soul crushing debt.
An endless treadmill of debt which failing to pay substantially speeds it up until an individual can not sustain themselves.