"Good" TTL value for DDNS clients ?

[Frank Bonnet]

Hello

I'm setting up a DDSN server , following the ISC documentation
it is working nicely.

But I would like some guidance on setting up the TTL value
for DHCP/DDNS clients.

We use a lot of dual boot machines WINDOWS/LINUX and
with default parameters the DDNS record isn't removed
from the DDNS when a user switch from one OS to another.

Any info help welcome.
Thanks.