Understanding Society User Support

Hello,

I am currently working on a project where the dependent variable(s) will be several measures of partnership quality, which we will measure using the self-completion relationship (screl) questions. In our sample will be included both cohabiting and married couples.

An important control variable that we will need to add will be the duration of the current partnership (or, how long the couple has been together). But we are having a bit of a hard time figuring out how to reliably construct an accurate variable measuring this using the available datasets on UK Data Service. I was wondering if there are any available guides on how one might go about doing this? Or, even better, if there are any known files with this information that have already been constructed? I recall that there was a 'Consolidated marital, cohabitation and fertility history' file available for BHPS, but I could not find anything like this for Understanding Society on UK Data Service.

Could you please advise at your earliest convenience?

Thank you,
Riley