The only onot perishah you are required to keep are the onah beinonit (thirtieth day), yom hachodesh (date on the Hebrew calendar), and haflagah (interval from the start of your previous period). On each of these vesatot you need to separate for one onah. This is one day (sunrise to sunset) or one night (sunset to sunrise), corresponding to the onset of your previous period. There is no requirement to keep extra onot perishah, but some couples take this custom upon themselves. It is certainly inadvisable to take on or keep this custom (or extra chumrot in general which might affect your marriage) when you and/or your husband travel frequently.

When one accepts a custom upon oneself, it eventually becomes an obligation. However, such an obligation is reversible by performing a hatarat nedarim. This involves standing in front of three men and reciting a specific text stating that you are no longer interested in this obligation. Only one of the three needs to know what the obligation was (there is no indication in the recitation). We therefore suggest you contact the rabbi of your community who will arrange the hatarat nedarim, after which you will no longer have to keep the extra vesatot.