Choosing a road pedal system - Focus on durability What road pedal system can you recommend? They should be durable (pedal and cleats), have no tendency to fail hazardously and work well (a bit of float, support against rotation around the forward axis (unlike SPD), fast and reliable to enter (I can click into RXS faster and more reliable than into SPD, mostly because the pedals are in a predictable angle. I miss the Xpressos more often that not)

I'm especially curious about SPD-SL and Look Keo, since I have no experience with them.

Backstory: I'm currently riding Time Xpresso 4. The cleats wear far too quickly to be acceptable (5 month / 4 Mm to get uncomfortable, after a bit more I rip the cleats out the pedal on hard acceleration). So instead of replacing the cleats I tend to replace the system. I had Time RXS before and switched over to Xpresso because the RXS were good while they lasted (~30 Mm) but one broke and caused a near-accident as well as a nasty scratch from the exposed axis on my shin. I hoped Time had addressed this in newer pedals, since others report the issue as well.

I realize similar question have been asked, but I still could not find one that answers the aspect of durability.
I'm a hugely biased exponent of speedplay pedals. The cleats are metal and I would say reasonably durable. I just walk around in mine for short distances like cafe stops, to/from the bike racks at work, but you can also get little covers for them. Or they make a walkable cleat (although I have no experience of these).

They have plenty of float with adjustment for heel in/out right the way down to no float at all. The pedals are double sided so clicking in doesn't require you to rotate the pedal to find the right side.

You do need to grease them though, there's a little screw on the side that you have to undo and squeeze grease in through every month or so - depending on your mileage and riding conditions. I've ridden several pairs into the ground before buying the grease gun to do it with, but my current pair are coming up to three years old.