There is no set number of entries stipulated by the college and good quality, reflective entries showing evidence of learning are much more important than vast numbers of entries. However, you should make sure that you make enough entries to give evidence of complete competency and curriculum coverage.
It is generally accepted that you should be making an average of 2-3 learning log entries in your eportfolio per week during ST1 and 2 and 5-6 per week during ST3, However, more may be required if you have not demonstrated the required coverage of either the curriculum or competencies.
Remember that until an entry is shared it is visible only to you so your trainer, PDs and the panel will not be able to give you any credit for that entry.