No it doesn't mean two seconds, it means 'two parts liquid to two parts powder'. With a brush it's almost impossible to know how much liquid is in a brush which is why we have to practise bead pick up over and over again until you work out the right ratio. NailsbyHayley has given you a good starting point, using the counting method is the best was to achieve consistency, but you need to work out your amount of wipes/holds/etc. based on your brush size, how hard you wipe, brand requirements, etc. Start with Hayley's suggestion and tweak where necessary.