It depends on the time of day, if you can use HOV, and the exits you use for driving. It can be a 20 minute commute if you have 2 people in the car and can use HOV, or much longer. Metro from Shady Grove to Bethesda is ~ 20 minutes, but depending on if you're driving or busing to SG, that can add time.
It can really depend on where in G'burg and where in Bethesda. When I leave straight from home (a couple of miles off the Montgomery Village exit), I make it to NIH in about 45 min on average. No traffic takes me about 25min and if it rains or there is an accident etc it can take about 1hr15min.
Re: Gaithersburg to Bethesda commute?
It can really depend on where in G'burg and where in Bethesda. When I leave straight from home (a couple of miles off the Montgomery Village exit), I make it to NIH in about 45 min on average. No traffic takes me about 25min and if it rains or there is an accident etc it can take about 1hr15min.