There is really no exact timeline for the decision of a visa application. Every application will be assessed on its own merits and it may take time or it maybe quick. The link below will give you a guide to the visa processing time. Hope it gives you an idea.

http://www.ukba.homeoffice.gov.uk/vi...ultTableAnchor

Also, here is a thread started by one of the members about timeline of settlement visas, flr, ilr etc. This may give you an idea as well.

http://filipinaroses.com/showthread....pouse+timeline