My M3 and my wifes's 300C heated seats take about 90 seconds to get toasty warm...the S4 takes about 6-10 minutes...why so long ???

BTW, My 335i seems to take a little longer than 90 seconds to get TOASTY! Warm yes, but not toasty in 90 secs. Perhaps it is because the leather is thicker in the Recaros.