My own feeling is this
If you wait until working the valves tells you they need oil, that means the valves are scraping.
The damage has already been done.
I oil too much.
Some people talk of how much oil they use per day. Like one drop per day.
So if you play for 30 minutes you use 1 drop, if you play for 12 hours do you still only use 1 drop.
This makes no sense.
I oil before I play then after an hour I oil again I might oil again if I play a third hour.
Oil stops valves scraping the valve block and wearing the block out.
I do not wish to turn my instrument into junk so I use a lot of oil. My valves never wear out.
I have a Besson that is 100 years old, it has the original copper valves which were fitted to the instrument in 1924, they should have worn out decades ago, but the valves are great and they are as tight as any I have played including a Yamaha.
The lesson is clear, over oil if you want your valves to last 100 years, under oil if you want them to only last 5 minutes.