You already tried it one weekend so you have some understanding
of how hard(or easy) it is for you. I guess you just have to try it
for real during your workweek to get a taste of things.

If you find that it's too hard, find some other alternatives. Can you
take your bike on public transportation partway? Instead of 3 days,
maybe just go for 2. If you're planning on riding in the rain, are you
and your bike equipped for that?