Have you ever read a Manhua\Manhwa ?
10 years is like months since cultivating there energy core can slow down there aging.
people can be 100ish years old looking 30ish.
Time moves so slow to them. its very understandable
I seen Manhua\Manhwa that show dudes being like 200ish years old looking like 15.
Cultivation ( Years of Refining your energy )( Can take Years )
Body Reconstruction ( Body Transformation that makes you stronger )( Takes hours or weeks to finish )
Seclusion Training ( Normally takes 1 to 5 years depending on how long you want to stay in Seclusion )
So 10years is normal.
Unless you want a Massive Montage of all the progresses, which would take Years of development.
The Timeskip is the best possible outcome without having to add all the troupes of the Cultivating Manhua genre.
Your biggest concern shouldn't be the Timeskip it should be when will the next update be lol
More things i just remembered.
If we are using Manhua troupes.
Every Qi stage\Level has a years to them.
1st stages are months maybe 1 year.
2nd stages are 3 or 5ish years
3rd stages are like 10ish years
4th stages are like 30ish years
You get my meaning refining energy takes years thats why most
Qi Gods are triple digit age.
The Medicine hall probably had Cultivating pills
that Normally has some sort of Qi Pills to help with gathering Qi
Some pills have 10ish years or 100ish years worth of Qi
depending how well you cultivating depends on how much of that Qi you absorb
Which can mean from the 10ish or 100ish years ones you end up only absorbing only 5 to 30 years of them
If you are bad at cultivating.
So to sum this up.. 10years isn't enough of a timeskip to help MC become a Qi god or reach the Demon Stages (manhua troupe)
at most 10years will put him in Qi Fusion or Qi Transcendence maybe even in the middle.
MC wouldn't be strong enough.
Give Mc a 30ish timeskip lol make him decently op