How to open access to the site for a while?

Question

PHP

For example, I uploaded a site to github and now it is necessary to give a potential buyer a demo of the site upon request, say for 5 minutes. I don’t quite understand how to implement this ...
No, you can, of course, go to the end and add / remove a redirect line to another site in htaccess, but I think this is nonsense, is there probably an adequate solution?
UPDATE
I need to make it impossible even to get to the site (more specifically, so that it is impossible to view files via devtools), and if these 5 minutes run out, then kick the user out of the site.

Answer 1

Make a demo user who will have access to everything you need. And by the way, you can redirect simply from php, why htaccess?

Answer 2

The idea is IMHO crazy (who needs to save what he needs in a couple of minutes), but these are your questions ...
Pass the client a link with a randomly generated hash (for example, from microtime + salt), and write the hash to the database. At the first entry, write the activation start time to the database; for further transitions, check whether 5 minutes have passed (track by session). If passed - throw it on the stub.
This implementation does not guarantee that if a person has spent 20 hours on 1 page, he will be thrown out "automatically". Only on the next request to the server.
In principle, you can also tie a javascript that will reload the page on a timer and throw it out of the system, but this protection of the level of the “do not walk on the lawns” sign costs at a time.