Enough time between flights Fra-Cairo

I'm assuming that's a single ticket you purchased from United, which protects you if you miss your connection. It's a legal connection for Frankfurt.

But even assuming that I would not book it for myself. Frankfurt is big. I always get lost. Even just transiting from one flight to another, I always have to wait in a security line along the way.

I like four hours for Frankfurt. If we're done early, we get a coffee and go to the bookstore.

Hi, Camille, I'm also transiting through Frankfurt on my way to Cairo, in January 2022. I arrive FRA at 11:40 am and am booked (through United, all on one ticket) on Egypt Air, a partner airline to UA, leaving FRA at 3:25 pm, arriving Cairo 8:20 pm. Given Ashley's experience with FRA airport, if you are booked on United, you might want to contact them NOW about moving you to a later flight to Cairo. Good luck!

and super long passport control /security lines countless times

No passport control should be needed for a non-Schengen to non-Schengen connection.

Has there been a change at Frankfurt? Several years back we arrived from the US late on LH, with bare minutes to make our connecting KLH flight o Istanbul. We had been bused from the tarmac the central bus location, we had not yet been rebooked, and we were directly told to run right through airside to our gate, which as still open. No passport/immigration checks anywhere (and no baggage issues as our bags were on our backs). As I recall, our departure was 9:05, we entered into the terminal at 8:55 and immediately ascertained our gate was still open. Luckily, the central bus stop was about the closest we could ever be to the B gates in Terminal 1. Had we actually gated we would have been over a 1/2 mile to our next gate on foot as that flight used the furthest T1 gate.

Passengers on a flight from non-Schengen airport connecting to
non-Schengen destination flight at Frankfurt do go thru passport
control.

That's not what their website says: "You are arriving from outside the Schengen Area and your destination is in a non-Schengen country: Usually no passport check is mandatory, provided that that you do not leave the transit zone."
https://www.frankfurt-airport.com/en/flights-and-transfer/transferring-at-fra.html

The thing that trips me up in Frankfurt is that I never know exactly what the gauntlet is going to entail and so I build in a lot of time there. On our last transit through - SEATTLE - FRANKFURT - CAIRO - using Condor and Egypt Air (separate tickets) we had to go through a security check line that had a wait to get to the front. Then, once there, we had to remove all of our electronics from our bags - and I mean ALL - and then repack it all. In addition, we did a lot of walking and I (inevitably) got lost.

We were unprepared for the depth of the electronics search. We had to pull out the camera chargers, the cameras, the charging cords for the iPads, the phones.

One of our party of two, who shall remain nameless, left an electronic device in his bag and then security went through his entire bag, socks, underwear and all.

It's just not an airport I would want to do in an hour.

Frankfurt airport is very efficient in moving people, going through security, etc., however, I would not want such a short connection time. Two hours would be recommended.

I will say this, several years ago, we had a flight connection at FRA and it was late arriving, we had about an hour until the departure of our next flight. We had to transfer terminals, which was easy, but had to go through security again. However, security allowed us to go to the head of the line, based on our time to departure for our next flight. We made the flight.

Thank you everyone! Think I’ll be calling United and ask for a later flight.