The problems have been well expressed previously.
Join as a Capt on the wide body. Thats as far as you can go, so therefore its just can you put up with the CAL system. The pay is reasonable. There are some good aspects to their system.
I found TPE not that bad a place to live, but I don't believe its a 5 year propersition. Look around as see the long termers. They are generally quite dark about things. That may be the city, the Co, the commute, the culture. Doesn't matter the reason, the result is the same. Time to leave.
If you join as an FO, then thats great as long as you understand that is as far as you will go. You fly along side some who are very marginal in standard (that includes expats). Most FOs want a career, an opportunity at progression. That is not available to you. CAL are now publically acknowledging that. Previously it was observation. Its not the pay that is attactive.
AS for how long that take to see. Thats up to you. Look critically at whether CAL is still offering what you want out of life and career. Don't just hope it will get better. It will not get better. CAL doesn't want it to get better.