i had a similar length of drive to & from work & i stopped working at about 33 weeks. i took annual leave for a couple of weeks & am now on proper mat leave. the driving itself wasn't/isn't a problem, but i found doing that amount of driving every day to be quite tiring & i was also having to get up before 6 each day so it wasn't an even longer drive because of the traffic.

my back was getting pretty sore & it was only when i stopped doing that drive every day that i realised it must have been due to sitting in the car for that long because it feels a lot better now.

i'd say it's probably different for each person though & i've definitely had no problems with driving in general.