I'm wondering how long groundswell from a tropical storm usually lasts. Let's say Bertha continues on its project path, maintains its status as a tropical storm, then starts heading away (towards the north and east) once it's a few hundred miles southeast of Bermuda.

Given these conditions, how long could we expect groundswell to last? I know there are many variables, but just looking for a rough timeframe (1 day, 2-3 days, 4-5 days, more?). Don't the longer period waves travel faster than the shorter period? Does this mean we'll get larger waves first and smaller later or does this only speak to the time between waves? Thanks in advance for any information...