vacation mode for daily chess

But our boss think it find for us to have it.

To be persuasive you have to address the counter arguments. If you pretend they don't exist you look silly.

An easy example is that vacation time can be used during vacation.
Another is when a person is sick.

my opponent is playing a move for about 3 months using vacation

Then your opponent is likely running low on vacation time.

In fact, your opponent hasn't been on in 21 days and only has 2 hours of vacation left.

Vacation is to cover you for when you will be away from chess.com for a while and may not have time for games, includings thing like emergencies.

Daily games can last for months at a time and tourneys can last for years. In that time frame people likely will have stretches where they can't make moves for some time and vacation time allows them to step away.

If you really don't like vacation time the play in no-vacation tourneys.  Or, suggest to the site to add a no-vacation option to seeks. Vacation time isn't going away.

Vacation time is still a crap idea.

ok. can chess.com make the vacation time shorter. like a week rather than 3 weeks.

because some player online use mobile data for network connection, and its very limited.

Real correspondence chess usually has built-in vacation time of some sort. This is only the second site that I've played correspondence on but I would guess that almost all of them have some kind of vacation implementation. 

One site had games with time banks. Basically, you had a certain number of extra days that could be used in the game, either for vacation or just to get a little extra thinking time in a complex position.

I kind of liked that implementation. Chess.com limiting the number of vacation days in games wouldn't be a terrible idea, whether it is configurable or not, but getting rid of them completely is a bad idea.