How about 2-3 years between coats? Depending on where you live of course. I recommend a yearly maintenance
coat to be safe.
You can do a search here on "Honey Teak". As I'm sure there have been other comments on it. I live in the Caribbean
and we usually have to re-coat every 6 months to keep regular varnish
up good. And that is with a start up of at least 8 coats if not 12.
2 things that are against this "varnish"
2) Tendency to NOT do a yearly maintenance
coat because it looks so good. If you let this stuff go it's hell to pay striping it off.
You can read more on my blog and see some photos too.