I'll just give you my opinion here. I would probably feel comfortable running 4AD for up to 12 weeks. You might even be able to run it longer without any issue. I would get blood work done and see what it comes back at and compare it to your TRT numbers.
If Androtest is really legit 4AD, then it would do a pretty good job as a temporary TRT replacement. Technically, based on what we know and some of the things I've read and heard, the original 4AD (not 4-DHEA), could be used as a legit cycle. It was strong enough to bring test levels to supraphysiological levels.... if money doesn't matter to you. Androtest is over $100 USD. If you wanted to run a legit test cycle on it, one bottle wouldn't even last you a week. 2 bottles per week might be the sweet spot for a cycle, which would bring it to over $200 per week just to run the test. Now I assume you aren't looking for supraphysiological levels, however if it costs that much to run a cycle, I doubt it would be affordable as a solution to TRT.
If you want my opinion on what you should do (and keep in mind I am not on TRT), I think you should look into other legit TRT solutions. A few people I know switched their TRT to subq and have not looked back. There are also gels, pellets, patches, etc. These forms of TRT don't work for everyone but they also work great for some. I know someone who gets good test levels from the patch and uses that for his TRT. Then he only switches to pinning when he decides to run a cycle and it seems to work for him. If you want to take a break from pinning or try something else, then I would look at those options first rather than getting it from 4AD.
