i travel 295 daily for work back and forth to trenton. anytime from 3pm - about 6:30/7pm can be a real pain in the ***. especially where 295s meets 42. backs up for miles every day between those times. rt95 won't be much better.
if you travel it early morning (before say 6:30am) it will be a lot better. but then you have traffic issues in del,md,wash and va. when i travel south i try to leave the house at 3:30-4am. this gets me past washington before the mess hits.. i'm about 2.5 hours from washington.
i haven't had much trouble traveling as far as the baltimore area just after morning rush hour. usually hit volume but not all that bad. after that good luck.. washington and va are a mess. and through va. set that cruise control for the speed limit. that entire state is a speed trap. once past Fredericksburg its usually pretty clear driving.
mostly it all depend what time you will be driving through these areas.. if you can rest during the day and travel at night you'll be a lot better off..