Quote from: virualcashtrade on August 27, 2017, 10:59:53 AM

Eg. If I replace my wallet.dat on 23/8/2017, and I put it back on 27/8/2017, the client will rescan the wallet from 23/8/2017.

Exactly this what I need as all 4 wallet.dat will be checked once a day. And rescan from start takes 10-11 hours....

Thanks for your answer.

Ah, I get this.

The best I can offer is an alternative to bitcoin core (unless you want to combine your wallets).

My suggestion would be electrum, downloadable here
For each wallet:
•Export private keys from bitcoin core
•On electrum, start it up and hit "standard wallet", then "use public or private keys" and ast the eys you've just exported from bitcoin core into it.
•You should be able to see your balances now after you just put in a pssword for the wallet to have.

An alternative to this:
1. Make 4 user accounts on your computer, each with administrative rights.
2. Start bitcoin core on all four putting a different wallet.dat file on each.
This does require you to have 4x the blockchain size (hence my alternative client suggestion).
UNLESS YOU USE -prune mode which will only keep the latest x number of blocks and will take up no more than 4 GB of space.

As an explanation to why this happens, bitcoin core must scan the entire blockchain in order to find your tansactions when you put a new wallet file in place.