Really depends, according to european rules a full rest out of base is only 10 hours or the duration of the last duty time, whichever is longer. However, as said above, split duty is possible and since it is not defined in EU OPS how that really works the rules currently differ by country. In my case all i need is three hours of rest (in a "quiet" hotel, including temperature and complete lighting control) within that duty and up to 18 hours in total is possible, however only two landings after the break are allowed for the whole crew.