I did not realize how much of my life I was wasting waiting around for mechjeb to for god knows why take like minutes to slowly warp up and down for almost any amount of warp needed.

I just made the simplest script I could think of off the top of my head, and it does 20 day warps in 5 real seconds, with seconds-accuracy. What was the point of all that waiting? :(

(probably not that different than others', but here below. Does not yet check for warp limits in low orbit around bodies, but that's just one if I think).

print "seconds: " totaltime.

set warplist to list(5,10,50,100,1000,10000,100000).

set highestwarp to 0.
for warpoption in warplist {
    if totaltime > warpoption{
        set highestwarp to highestwarp 1.
    }
}

print highestwarp.
set warp to highestwarp.
wait totaltime-warplist[highestwarp-1]/2.
set warp to 0.

(integral of a linear ramp up is 1/2 * (linear slope) * x² in this case, ramps up over 1 second, so x² = 1, slope is just the listed warp rate, so ramp up to 100,000 takes 50,000 seconds for instance)

question: is the table of warp limits per body a kos variable anywhere? Can't find it.