Quote; 25-30psi I see that folks use for a 1-2 week force carbing.
nope, nobody with any success would connect at that high of a pressure for weeks and get any good result unless you are making a highly carbonated beverage.
Unless you have some way to measure the pressure of dissolved C02, leaving the pressure connected at a higher pressure than serving pressure is a formula for problems.
Set-and-forget is 10-14 days at your serving pressure and serving temp (36-38f).
Force carbonation can be done in a few minutes at a higher pressure with chilled beer if you know what you are doing. Do some searching and there is information on how to start at a higher pressure and work your way down while shaking and getting a keg carbonated within a few PSI of perfect serving pressure within about 10 minutes. A bit more complicated, but accurate.
The worst way is leaving your keg connected for days at some higher pressure that will result in unknown results. Although people eventually get an idea how to get results with this unpredictable method, it involves way to much trial and failure to suggest to other brewers who are trying to learn.