Efficacy of using short timeout values for an A record

[goran kent]

Hi,

I need to setup an A record for a machine who's IP might change
unexpectedly, and I need to ensure PCs out there cache it for as short
a time as possible:

    host1    300  IN A 10.10.10.10

Does anyone know whether MS windows PCs will in fact honour that 300s,
then force a re-lookup?  Can I use even shorter values?  eg, 60?

I know this will lead to extra DNS traffic, but this is only for this
particular case.

Thanks for any comments.

Regards
gk