probably after the 2nd day your gonna notice you can handle it a lot more and wont get so wasted from it. from my experience this is the case. the first 2 or 3 times i take a benzo (for a semi extended period) i basically black out and fall asleep, even with low doses.
once i gain a little bit of a tolerance to them i notice they help a lot more with anxiety and i can actually benefit from using them. i used to hate benzos until i got a small tolerance. now i like to take half a xanax bar or a 10mg valium every once in awhile just because its a nice feeling and i can handle it, without forgetting the entire night.
to be more accurate, if your brand new to valium then the first few times you take it you'll probably feel it a lot. after that you'll be used to it and can probably stay on that same dose for a few months without losing much. i've been taking 1 mg xanax for a few months and still always get effects from it. i dont do it daily but probably do 4-6 nights in a week.