diya going out early

hello everybody, i'm fairly new to hinduism and started offering deepam daily as of late. things have been going pretty smoothly up until around yesterday when my diya started going out much earlier than it should. from my own research i concluded that this shouldn't mean anything and that i should just relight it, so that's what i've been doing, but i've had to repeat making wicks and lighting again up to three times in a row before it finally would stay lit for longer than ten minutes. it typically burns for up to two hours at most. so my question here is, when it gets to the point of having been lit for 20-40 minutes and entirely went out on its own with no outside interferance, would that count since it is supposed to go out on its own anyways? is it more about the act of offering than the duration that it burns? especially since i'm doing this daily and don't want to waste oil. i'm using a small brass aladdin style oil lamp with mustard oil and rolling my own wicks with cotton if that helps anything. if anyone knows what i could be doing wrong in terms of lighting the diya that would be helpful too, thank you.