About 10 mins if you can turn a wrench. Adaptor on tank inlet to run the bidet, and unscrew and rescrew the bolts holding the seat in place. Just need wrench, screwdriver, and plumbers tape.
Best thing for a septic system ever!
Decent is the Snap safe unit- 12 gauge construction
https://www.gunsafes.com/store/p/64450-SnapSafe-Vault-Door.html?nis=6
Serious go with the Sturdy Safe- 3/8" construction
https://www.sturdysafe.com/products/vault-door
Go with the inswing so you can't get locked in......
I have used both...