Run them until just shy of smoking or turning blue.
Some drill bits are better than others, I found that the Jobber bits made in cobalt steel work best for me
and if I do hit a tough spot in the stainless I keep a spray can of Kroil handy. ( cools the bit and metal ).
I have used the other stuff that comes in a small can which is used for thread cutting and machine tools
but can't remember the name of it.
Doesn't matter how many inches per second a drill bit chews a hole unless you are programming a CNC machine.
Just the right speed.. The right amount of pressure and no-wiggling the drill..
of course drilling through a weld area in stainless will test your patience but it can be done...