I used to use Hoppe’s oil. I cleaned the slide(s) on both the frame and slide with alcohol and re-lubed once a month. The oil was always dried up at this interval.
That interval has increased to about every 3 months after I changed to G96 Synthetic oil. The oil still has not dried up, but I remove it with alcohol and re-lube anyway.
I always perform a complete function test with snap caps after reassembly. I then do some dry fire training before reloading because I probably have not spent any quality time with the staged firearm in a while.